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Any depolarizing event would need to be one where the causes are transparently external in a way that makes it hard for social groups to blame each other

Of the episodes since 1950 where democracies polarized, all of those aside from the United States involved less wealthy, less longstanding democracies, many of which had democratized quite recently.

A series of recent analyses reveals the destructive power of polarization across the American political system.

The United States is quite alone among the ranks of perniciously polarized democracies in terms of its wealth and democratic experience

It is increasingly hard to see what sort of event has that feature these days.

None of the wealthy, consolidated democracies of East Asia, Oceania or Western Europe, for example, have faced similar levels of polarization for such an extended period.

“the United States is the only advanced Western democracy to have faced such intense polarization for such an extended period. The United States is in uncharted and very dangerous territory.”

there are “a number of features that make the United States both especially susceptible to polarization and especially impervious to efforts to reduce it.”

The authors point to a number of causes, including “the durability of identity politics in a racially and ethnically diverse democracy.”

the United States has “a unique combination of a majoritarian electoral system with strong minoritarian institutions.”

An additional cause, the authors write, is thatbinary choice is deeply embedded in the U.S. electoral system, creating a rigid two-party system that facilitates binary divisions of society. For example, only five of twenty-six wealthy consolidated democracies elect representatives to their national legislatures in single-member districts.

The United States is perhaps alone in experiencing a demographic shift that poses a threat to the white population that has historically been the dominant group in all arenas of power, allowing political leaders to exploit insecurities surrounding this loss of status.

“The Senate is highly disproportionate in its representation,” they add, “with two senators per state regardless of population, from Wyoming’s 580,000 to California’s 39,500,000 persons,” which, in turn, “translates to disproportionality in the Electoral College — whose indirect election of the president is again exceptional among presidential democracies.”

finally, there is the three-decade trend of partisan sorting, in whichthe two parties reinforce urban-rural, religious-secular and racial-ethnic cleavages rather than promote crosscutting cleavages. With partisanship now increasingly tied to other kinds of social identity, affective polarization is on the rise, with voters perceiving the opposing party in negative terms and as a growing threat to the nation.

Two related studies — “Inequality, Identity and Partisanship: How Redistribution Can Stem the Tide of Mass Polarization” by Alexander J. Stewart, Joshua B. Plotkin and McCarty and “Polarization Under Rising Inequality and Economic Decline” by Stewart, McCarty and Joanna Bryson — argue that aggressive redistribution policies designed to lessen inequality must be initiated before polarization becomes further entrenched

“once polarization sets in, it typically remains stable under individual-level evolutionary dynamics, even when the economic environment improves or inequality is reversed.”

Interactions with more diverse out-group members pool greater knowledge, applicable to a wider variety of situations. These interactions, when successful, generate better solutions and greater benefits. However, we also assume that the risk of failure is higher for out-group interactions

At the same time, the spread of polarization goes far beyond politics, permeating the culture and economic structure of the broader society.

economic scarcity acts as a strong disincentive to cooperative relations between disparate racial and ethnic groups, in large part because such cooperation may produce more benefits but at higher risk:

In other words, a deeply polarized electorate is highly unlikely to support redistribution that would benefit their adversaries as well as themselves.

In times of prosperity, people are more willing to risk failure, they write, but that willingness disappears when populations arefaced with economic decline. We show that such group polarization can be contagious, and a subpopulation facing economic hardship in an otherwise strong economy can tip the whole population into a state of polarization.

A key finding in our studies is that it really matters when redistributive policies are put in place. Redistribution functions far better as a prevention than a cure for polarization in part for the reason your question suggests: If polarization is already high, redistribution itself becomes the target of polarized attitudes.

Using “data from Amazon, 82.5 million reviews of 9.5 million products and category metadata from 1996-2014,” the authors determined which “product categories are most politically relevant, aligned and polarized.”

While the processes Zmigrod describes characterize the extremes, the electorate as a whole is moving farther and farther apart into two mutually loathing camps.

even small categories like automotive parts have notable political alignment indicative of lifestyle politics. These results indicate that lifestyle politics spread deep and wide across markets.

political psychologists dispute the argument that only “conservatism is associated with prejudice” and that “the types of dispositional characteristics associated with conservatism (e.g., low cognitive ability, low openness) explain this relationship.”

“when researchers use a more heterogeneous array of targets, people across the political spectrum express prejudice against groups with dissimilar values and beliefs.”

Earlier research has correctly found greater levels of prejudice among conservatives, they write, but these studies have focused on prejudice toward liberal-associated groups: minorities, the poor, gay people and other marginalized constituencies.

when the targets of prejudice are expanded to include “conservative-associated groups such as Christian fundamentalists, military personnel and ‘rich people,’” similar levels of prejudice emerge.

Caughey and his co-authors showa surprisingly close correspondence between mass and elite trends.

“people high in cognitive ability are prejudiced against more conservative and conventional groups,” while “people low in cognitive ability are prejudiced against more liberal and unconventional groups.”

he “rigidity-of-the-right hypotheses” should be expanded in recognition of the fact that “cognitive rigidity is linked to ideological extremism, partisanship and dogmatism across political and nonpolitical ideologies.”

“extreme right-wing partisans are characterized by specific psychological traits including cognitive rigidity and impulsivity. This is also true of extreme left-wing partisans.”

a clear inverted-U shaped curve emerged such that those on the extreme right and extreme left exhibited cognitive rigidity on neuropsychological tasks, in comparison to moderates.

“Low openness to experience is associated with prejudice against groups seen as socially unconventional (e.g., atheists, gay men and lesbians),” they write, whereas high openness is “associated with prejudice against groups seen as socially conventional (e.g., military personnel, evangelical Christians).

Analyzing these “pervasive lifestyle politics,” Ruch, Decter-Frain and Batra find that “cultural products are four times more polarized than any other segment.”

1) ideological divergence between Democrats and Republicans has widened dramatically within each domain, just as it has in Congress;

(2) ideological variation across senators’ partisan subconstituencies is now explained almost completely by party rather than state, closely tracking trends in the Senate

(3) economic, racial and social liberalism have become highly correlated across partisan subconstituencies, just as they have across members of Congress

Caughey, Dunham and Warshaw describe the growing partisan salience of racial and social issues since the 1950s:The explanatory power of party on racial issues increased hugely over this period and that of state correspondingly declined. We refer to this process as the “ideological nationalization” of partisan subconstituencies.

In the late 1950s, they continue,party explained almost no variance in racial conservatism in either arena. Over the next half century, the Senate and public time series rise in tandem.

Contrary to the claim that racial realignment had run its course by 1980, they add, “our data indicate that differences between the parties continued to widen through the end of the 20th century, in the Senate as well as in the mass public. By the 2000s, party explained about 80 percent of the variance in senators’ racial conservatism and nearly 100 percent of the variance in the mass public.

“it has limited the two parties’ abilities to tailor their positions to local conditions. Moreover, it has led to greater geographic concentration of the parties’ respective support coalitions.”

Today, across all offices, conservative states are largely dominated by Republicans, whereas the opposite is true of liberal states. The ideological nationalization of the party system thus seems to have undermined party competition at the state level.

this will continue to give ideological extremists an advantage in both parties’ primaries. It also means that the pool of people that run for office is increasingly extreme.

It will probably reduce partisans’ willingness to vote for the out-party. This could dampen voters’ willingness to hold candidates accountable for poor performance and to vote across party lines to select higher-quality candidates. This will probably further increase the importance of primaries as a mechanism for candidate selection.

Looking over the contemporary political landscape, there appear to be no major or effective movements to counter polarization.

As the McCoy-Press report shows, only 16 of the 52 countries that reached levels of pernicious polarization succeeded in achieving depolarization and in “a significant number of instances later repolarized to pernicious levels. The progress toward depolarization in seven of 16 episodes was later undone.”

That does not suggest a favorable prognosis for the United States.

crowd as a dangerous fringe. When “your side” has 60 percent or more of the public behind it, you should talk about it — a lot.

Second, because we have millions of people who are receptive to calls for violence, we need a serious and visible law-enforcement and national-security response.

Third, we lack a serious whole-of-society response to the threat of domestic extremism. A proper one should address inroads it has made into the military, and it must include White evangelicals’ recognition of the growing connection between Christian nationalism and violence.

actors in civil society and philanthropy should start working to anticipate and prevent violence, reset public leaders’ conduct, strengthen social cohesion and bolster democratic reforms.

In sum, we have treated the problem of violent extremism too broadly (causing politicians to cower in fear of a political minority), and too narrowly (focusing too much on legal and political reforms)

We need to start acting as though we are under threat from a pernicious, anti-democratic and violent minority — because we are.

In earlier cultural epochs, many people derived their self-worth from their relationship with God, or from their ability to be a winner in the commercial marketplace

As Lasch wrote in his 1979 book, “The Culture of Narcissism,” such people are plagued by an insecurity that can be “overcome only by seeing his ‘grandiose self’ reflected in the attentions of others.”

“Plagued by anxiety, depression, vague discontents, a sense of inner emptiness, the ‘psychological man’ of the 20th century seeks neither individual self-aggrandizement nor spiritual transcendence but peace of mind, under conditions that increasingly militate against it.”

Fast forward a few decades, and the sense of lostness and insecurity, which Lasch and many others had seen in nascent form, had transmogrified into a roaring epidemic of psychic pain. By, say, 2010, it began to be clear that we were in the middle of a mental health crisis, with rising depression and suicide rates, an epidemic of hopelessness and despair among the young.

Before long, safetyism was on the march. This is the assumption that people are so fragile they need to be protected from social harm. Slate magazine proclaimed 2013 “the year of the trigger warning.” Concepts like “microaggression” and “safe spaces” couldn’t have lagged far behind.

Social media became a place where people went begging for attention, validation and affirmation — even if they often found rejection instead.

the elephantiasis of trauma

Once, the word “trauma” referred to brutal physical wounding one might endure in war or through abuse. But usage of the word spread so that it was applied across a range of upsetting experiences.

A mega-best-selling book about trauma, “The Body Keeps the Score,” by Bessel van der Kolk, became the defining cultural artifact of the era. Parul Sehgal wrote a perceptive piece in The New Yorker called “The Case Against the Trauma Plot,” noting how many characters in novels, memoirs and TV shows are trying to recover from psychological trauma — from Ted Lasso on down. In January 2022, Vox declared that “trauma” had become “the word of the decade,” noting that there were over 5,500 podcasts with the word in the title.

For many people, trauma became their source of identity. People began defining themselves by the way they had been hurt.

a culture war, and that’s what happened to the psychological crisis. In one camp, there were the coddlers.

They sought to alter behavior and reform institutions so that no one would feel emotionally unsafe

the first bad idea in “The Coddling of the American Mind.” It was the notion that “what doesn’t kill you makes you weaker,” inducing people to look at the wounds in their past and feel debilitated, not stronger.

the coddling approach turned out to be counterproductive. It was based on a series of false ideas that ended up hurting the people it was trying to help.

People on all sides genuinely come to believe they are powerless, unwilling to assume any responsibility for their plight — another classic symptom of immaturity.

The third bad idea is, “If I keep you safe, you will be strong.”

But overprotective parenting and overprotective school administration don’t produce more resilient children; they produce less resilient ones.

The counterreaction to the coddlers came from what you might call the anti-fragile coalition. This was led by Jordan Peterson and thousands of his lesser imitators

they merely represented the flip side of the fragile victim mind-set.

The right-wing victimologists feel beset by hidden forces trying to oppress them, by a culture that conspires to unman them, dark shadowy conspiracies all around

recent right-wing narratives, even J.D. Vance’s “Hillbilly Elegy,” often follow the trauma formula: “Take the lamentations about atrophying manhood and falling sperm counts. Call it what you want, but the core idea is always shaped like trauma. Once, we were whole, but now we’re not; now we suffer from a sickness we struggle to grasp or name.”

The instability of the self has created an immature public culture — impulsive, dramatic, erratic and cruel. In institution after institution, from churches to schools to nonprofits, the least mature voices dominate and hurl accusations, while the most mature lie low, trying to get through the day.

They are considerate to and gracious toward others because they can see situations from multiple perspectives

The founders of the therapeutic ethos thought they were creating autonomous individualists who would feel good about themselves. But, as Lasch forecast: “The narcissist depends on others to validate his self-esteem. He cannot live without an admiring audience. His apparent freedom from family ties and institutional constraints does not free him to stand alone or to glory in his individuality. On the contrary, it contributes to his insecurity.”

Maturity, now as ever, is understanding that you’re not the center of the universe. The world isn’t a giant story about me.

In a nontherapeutic ethos, people don’t build secure identities on their own. They weave their stable selves out of their commitments to and attachments with others. Their identities are forged as they fulfill their responsibilities as friends, family members, employees, neighbors and citizens. The process is social and other-absorbed; not therapeutic.

Maturity in this alternative ethos is achieved by getting out of your own selfish point of view and developing the ability to absorb, understand and inhabit the views of others.

Mature people are calm amid the storm because their perception lets them see the present challenges from a long-term vantage.

The second false idea was, “I am a thing to whom things happen.” The traumatized person is cast as a passive victim unable to control his own life. He is defined by suffering and

They can withstand the setbacks because they have pointed their life toward some concrete moral goal.

“one of the greatest indicators of our own spiritual maturity is revealed in how we respond to the weaknesses, the inexperience and the potentially offensive actions of others.”

a sign of maturity is the ability to respond with understanding when other people have done something stupid and given you the opportunity to feel superior.

Convincing some of Bernard’s neighbours to join in initially proved more of a challenge. Among them was Mireille Roberdeau, who has lived in the same top-floor flat in Rue de l’Aude since 2000, when her late husband worked for the company that built it. Aged 88, she is the doyenne of the “super neighbours”.

A former executive at Ouest-France, the country’s biggest newspaper, he has long been fascinated by how people interact, and read widely the academic literature on the subject. It was only after he was made a redundant a decade with a “big cheque”, however, that he had the chance to implement his ideas.

“I had the choice of buying a house or financing this project,” said Bernard. “I told my wife I would only do it for three years and then go back to normal life. But I lied and I decided to keep on doing it.” Several years on, his wife, Béatrice, appears to have forgiven him.

Bernard’s own project began with the simple idea of encouraging people to say “bonjour” to each other a bit more. “Our challenge, which was slightly stupid but also slightly poetic, was to transform neighbours who say hello to each other into ‘super neighbours’ who say hello 50 times a day,” he told me a few days before the lunch. “It’s all about finding the lowest common denominator.”

Patrick Bernard, 63, the group’s founder, is evangelical about hyperlocalism. He thinks the way to improve social cohesion and quality of life in big cities is to encourage the rise of “micro-neighbourhoods”, or what he calls “three-minute villages”. Such grassroots initiatives, he argues, can complement a recent “top down” drive by planners in Paris and elsewhere to create “15-minute cities”, in which everything needed for daily life is within easy reach.

The main emphasis, though, is on encouraging people to meet and get to know those who live around them, helped by dozens of WhatsApp groups, covering everything from pets, knitting and babysitting to cheese, fish and baking cakes. Membership is free.

Six years after the pioneers first sat down together, the group has expanded into every aspect of the lives of the 5,000 residents living in 15 or so local roads: it is in part about improving the environment, whether planting greenery in the street, finding innovative ways to recycle or compost or transforming the once-traffic-filled local square — Place des Droits-de-l’Enfant — into a village square, with a market, benches for people to sit and concerts.

The annual Table d’Aude — or the “longest table in Paris”, as it styles itself — is the work of a group called La République des Hyper Voisins (The Republic of the Super Neighbours), which aims to recreate the traditional conviviality of village life in a big-city setting.

the growing divisions between red and blue states represent a reversion to the lines of separation through much of the nation’s history.

“very similar, both geographically and culturally, to the divides between the Union and the Confederacy. And those dividing lines were largely set at the nation’s founding, when slave states and free states forged an uneasy alliance to become ‘one nation.’”

he’s warning that the pressure on the country’s fundamental cohesion is likely to continue ratcheting up in the 2020s

the “MAGA movement”—as the U.S. equivalent to the authoritarian parties in places such as Hungary and Venezuela. It is a multipronged, fundamentally antidemocratic movement that has built a solidifying base of institutional support through conservative media networks, evangelical churches, wealthy Republican donors, GOP elected officials, paramilitary white-nationalist groups, and a mass public following

Virginia has voted like a blue state at the presidential level, and Arizona and Georgia have moved from red to purple. With these three states shifted into those categories, the two “nations” are almost equal in eligible voting-age population, and the blue advantage in GDP roughly doubles, with the blue section contributing 48 percent and the red just 35 percent.)

This divergence itself creates enormous strain on the country’s cohesion, but more and more even that looks like only a way station

the underlying political question of the 2020s remains whether majority rule—and democracy as we’ve known it—can survive this offensive.

Podhorzer defines modern red and blue America as the states in which each party has usually held unified control of the governorship and state legislature in recent years.

By that yardstick, there are 25 red states, 17 blue states, and eight purple states

the red nation houses slightly more of the country’s eligible voting population (45 percent versus 39 percent), but the blue nation contributes more of the total U.S. gross national product: 46 percent versus 40 percent

it is determined to impose its policy and social vision on the entire country—with or without majority support

The hardening difference between red and blue, Podhorzer maintains, “empowers” the 10 purple states (if you include Arizona and Georgia) to “decide which of the two superpower nations’ values, Blue or Red, will prevail” in presidential and congressional elections

that leaves the country perpetually teetering on a knife’s edge: The combined vote margin for either party across those purple states has been no greater than two percentage points in any of the past three presidential elections

That’s a reversal from the middle decades of the 20th century, when the basic trend was toward greater convergence.

One element of that convergence came through what legal scholars call the “rights revolution.” That was the succession of actions from Congress and the Supreme Court, mostly beginning in the 1960s, that strengthened the floor of nationwide rights and reduced the ability of states to curtail those rights.

Key moments in that revolution included the passage of the Civil Rights and Voting Rights Acts and the Supreme Court decisions striking down state bans on contraception, interracial marriage, abortion, and, much later, prohibitions against same-sex intimate relations and marriage.)

Simultaneously, the regional differences were moderated by waves of national investment, including the New Deal spending on rural electrification, the Tennessee Valley Authority, agricultural price supports, and Social Security during the 1930s, and the Great Society programs that provided federal aid for K–12 schools and higher education, as well as Medicare and Medicaid.

The impact of these investments (as well as massive defense spending across both periods) on states that had historically spent little on public services and economic development helped steadily narrow the gap in per capita income between the states of the old Confederacy and the rest of the country from the 1930s until about 1980.

Since about 2008, Podhorzer calculates, the southern states at the heart of the red nation have again fallen further behind the blue nation in per capita income.

red states, as a group, are falling behind blue states on a broad range of economic and social outcomes—including economic productivity, family income, life expectancy, and “deaths of despair” from the opioid crisis and alcoholism.

other measures that show those places in a more favorable light

Housing is often more affordable in red states; partly for that reason, homelessness has become endemic in many big blue cities. Red-state taxes are generally lower than their blue counterparts. Many red states have experienced robust job growth

And red states across the Sun Belt rank among the nation’s fastest growing in population.

blue states are benefiting more as the nation transitions into a high-productivity, 21st-century information economy

red states (apart from their major metropolitan centers participating in that economy) are suffering as the powerhouse industries of the 20th century—agriculture, manufacturing, and fossil-fuel extraction—decline.

The gross domestic product per person and the median household income are now both more than 25 percent greater in the blue section than in the red,

The share of kids in poverty is more than 20 percent lower in the blue section than red, and the share of working households with incomes below the poverty line is nearly 40 percent lower.

Gun deaths are almost twice as high per capita in the red places as in the blue, as is the maternal mortality rate.

Per capita spending on elementary and secondary education is almost 50 percent higher in the blue states compared with red

All of the blue states have expanded access to Medicaid under the Affordable Care Act, while about 60 percent of the total red-nation population lives in states that have refused to do so.

All of the blue states have set a minimum wage higher than the federal level of $7.25, while only about one-third of the red-state residents live in places that have done so.

Right-to-work laws are common in the red states and nonexistent in the blue, with the result that the latter have a much higher share of unionized workers than the former

No state in the blue section has a law on the books banning abortion before fetal viability, while almost all of the red states are poised to restrict abortion rights

Almost all of the red states have also passed “stand your ground” laws backed by the National Rifle Association, which provide a legal defense for those who use weapons against a perceived threat, while none of the blue states have done so.

During the seven decades of legal Jim Crow segregation from the 1890s through the 1960s, the principal goal of the southern states at the core of red America was defensive: They worked tirelessly to prevent federal interference with state-sponsored segregation but did not seek to impose it on states outside the region.

Jim Crow segregation offers an important reference point for understanding how far red states might take this movement to roll back civil rights and liberties—not that they literally would seek to restore segregation, but that they are comfortable with “a time when states” had laws so “entirely different” that they created a form of domestic apartheid.

The flurry of socially conservative laws that red states have passed since 2021, on issues such as abortion; classroom discussions of race, gender, and sexual orientation; and LGBTQ rights, is widening this split. No Democratic-controlled state has passed any of those measures.

he documents a return to historical patterns from the Jim Crow era in which the dominant party (segregationist Democrats then, conservative Republicans now) has skewed the playing field to achieve a level of political dominance in the red nation far beyond its level of popular support

Undergirding that advantage, he argues, are laws that make registering or voting in many of the red states more difficult, and severe gerrymanders that have allowed Republicans to virtually lock in indefinite control of many state legislatures

how the United States will function with two sections that are moving so far apart.

History, in my view, offers two models

bedrock differences dating back to the country’s founding are resurfacing. And one crucial element of that, he argues, is the return of what he calls “one-party rule in the red nation.”

in the last years before the Civil War, the South’s political orientation was offensive: Through the courts (the 1857 Dred Scott decision) and in Congress (the Kansas-Nebraska Act in 1854), its principal aim was to authorize the expansion of slavery into more territories and states

Podhorzer, like Mason and Grumbach, believes that the MAGA movement’s long-term goal is to tilt the electoral rules in enough states to make winning Congress or the White House almost impossible for Democrats

Then, with support from the GOP-appointed majority on the Supreme Court, Republicans could impose red-state values and programs nationwide, even if most Americans oppose them. The “MAGA movement is not stopping at the borders of the states it already controls,” Podhorzer writes. “It seeks to conquer as much territory as possible by any means possible.”

The Trump model, in other words, is more the South in 1850 than the South in 1950, more John Calhoun than Richard Russell

it does mean that the 2020s may bring the greatest threats to the country’s basic stability since those dark and tumultuous years.

Mr. Johnson is far from alone in having expressed deep concerns about Mr. Trump, only to go on to later embrace him and his agenda.In 2015, Senator Lindsey Graham of South Carolina called Mr. Trump a “race-baiting, xenophobic, religious bigot,” as well as a “kook,” “crazy” and a man who was “unfit for office.” He went on to serve as Mr. Trump’s most loyal defender in the Senate.

Senator Ted Cruz of Texas, the second-to-last man left standing in the 2016 Republican primary race, called Mr. Trump a “pathological liar” who was “utterly amoral,” a “serial philanderer” and a “narcissist at a level I don’t think this country’s ever seen.” Mr. Cruz has explained his decision to become a loyal defender of Mr. Trump as something that was a “responsibility” to his constituents

Mick Mulvaney, the former Republican congressman who went on to serve as the president’s acting chief of staff, in 2016 called his future boss a “terrible human being” who had made “disgusting and indefensible” comments about women.

Unlike the other lawmakers who fell in line, however, Mr. Johnson has pitched himself as someone of deep religious convictions, whose worldview is driven by his faith.

Dr. Longo, who is also a professor of gerontology and director of the U.S.C. Longevity Institute in California, has long advocated longer and better living through eating Lite Italian, one of a global explosion of Road to Perpetual Wellville theories about how to stay young in a field that is itself still in its adolescence.

In addition to identifying genes that regulate aging, he has created a plant and nut-based diet with supplements and kale crackers that mimics fasting to, he argues, allow cells to shed harmful baggage and rejuvenate, without the down side of actually starving.

He has patented and sold his ProLon diet kits; published best-selling books (“The Longevity Diet”); and been called an influential “Fasting Evangelist” by Time magazine.

Last month, he published a new study based on clinical trials of hundreds of older people — including in the Calabria town from which his family hails — that he said suggests that periodic cycles of his own faux-fasting approach could reduce biological age and stave off illnesses associated with aging.

“It’s very similar to the original Mediterranean diet, not the present one,” she said, pointing at photographs on the wall of a bowl of ancient legumes similar to the chickpe

“Almost nobody in Italy eats the Mediterranean diet,”

He added that many Italian children, especially in the country’s south, are obese, bloated on what he calls the poisonous five Ps — pizza, pasta, protein, potatoes and pane (or bread).

in recent years, Silicon Valley billionaires who hope to be forever young have funded secretive labs. Wellness articles have conquered newspaper home pages and Fountains-of-Youth workout and diet ads featuring insanely fit middle-aged people teem on the social media feeds of not insanely fit middle-aged people.

he said Italy’s lack of investment in research was a disgrace.

even as concepts like longevity, intermittent fasting and biological age — you’re only as old as your cells feel! — have gained momentum, governments like Italy’s are fretting over a creakier future in which booming populations of old people drain resources from the dwindling young.

many scientists, nutritionists and longevity fanatics the world over continue to stare longingly toward Italy, seeking in its deep pockets of centenarians a secret ingredient to long life.

“Probably they kept breeding between cousins and relatives,” Dr. Longo offered, referring to the sometimes close relations in little Italian hill towns. “At some point, we suspect it sort of generated the super-longevity genome.”

The genetic drawbacks of incest, he hypothesized, slowly vanished because those mutations either killed their carriers before they could reproduce or because the town noticed a monstrous ailment — like early onset Alzheimer’s — in a particular family line and steered clear.

Dr. Longo wonders whether Italy’s centenarians had been protected from later disease by a starvation period and old-fashioned Mediterranean diet early in life, during rural Italy’s abject war-era poverty. Then a boost of proteins and fats and modern medicine after Italy’s postwar economic miracle protected them from frailty as they got older and kept them alive.

At age 16, he moved to Chicago to live with relatives and couldn’t help notice that his middle-aged aunts and uncles fed on the “Chicago diet” of sausages and sugary drinks suffered diabetes and cardiovascular disease that their relatives back in Calabria did not.

He eventually earned his Ph.D in biochemistry at U.C.L.A. and did his postdoctoral training in the neurobiology of aging at U.S.C. He overcame early skepticism about the field to publish in top journals and became a zealous evangelizer for the age-reversing effects of his diet. About 10 years ago, eager to be closer to his aging parents in Genoa, he took a second job at the IFOM oncology institute in Milan.

He found a fount of inspiration in the pescatarian-heavy diet around Genoa and all the legumes down in Calabria.

he also found the modern Italian diet — the cured meats, layers of lasagna and fried vegetables the world hungered for — horrendous and a source of disease.

His private foundation, also based in Milan, tailors diets for cancer patients, but also consults for Italian companies and schools, promoting a Mediterranean diet that is actually foreign to most Italians today.

“Italy’s got such incredible history and a wealth of information about aging,” he said. “But spends virtually nothing.”

He talked about how he and others had identified an important regulator of aging in yeast, and how he has investigated whether the same pathway was at work in all organisms.

Dr. Longo said he thinks of his mission as extending youth and health, not simply putting more years on the clock, a goal he said could lead to a “scary world,” in which only the rich could afford to live for centuries, potentially forcing caps on having children

A more likely short-term scenario, he said, was division between two populations. The first would live as we do now and reach about 80 or longer through medical advancements. But Italians would be saddled with long — and, given the drop in the birthrate, potentially lonely — years burdened by horrible diseases.

The other population would follow fasting diets and scientific breakthroughs and live to 100 and perhaps 110 in relative good health.

In the 1960s fantasyland goes into overdrive. Psychedelics, academic scholarship and the New Age movement conspire to make reason and reality the realms of idiots and squares.

After the Kennedy assassinations, conspiracy theories become not just a fringe hobby but a “permanent feature of the American mental landscape.” U.F.O. sightings explode, and the stories become ever more elaborate

In the meantime, a kind of comfort with small fibs settles into the populace. When Andersen was young, he recalls, it was rare to see a woman over 50 whose hair was not gray or white. And apparently there were only eight plastic surgeons in all of Manhattan. But the market for hair color and plastic surgery explodes, as America starts writing its “national fiction of permanent youthfulness.”

the most persistent thread in “Fantasyland” is Christianity — the astounding number of Americans who believe in heaven and angels, which most of Europe gave up decades ago

Andersen reserves a starring role for the secular spiritualists. They were supposed to be a counterpoint to narrow-minded evangelicals, but Andersen says the New Agers committed an even greater sin than the faithful. What Anne Hutchinson started, Gestalt therapy finished off in the ’60s. Fritz Perls, a psychotherapist and Gestalt founder, simply put it: “I do my thing and you do your thing. I am not in this world to live up to your expectations, and you are not in this world to live up to mine.” Or put more simply: You do you.

If there’s a flaw in this book, it’s repetitiveness. Andersen seems by nature a collector. He goes for wide rather than deep. So he doesn’t examine, for example, how we would separate the junk from the gems

What we Americans need, it would seem, is something more powerful. A story to end all stories, preached by someone with the fire of Anne Hutchinson. A collective delusion so seductive that it will have us all, in Locke-step, bowing down to reason and reality.

our real progenitors were the Puritans, who passed the weeks on the trans-Atlantic voyage preaching about the end times and who, when they arrived, vowed to hang any Quaker or Catholic who landed on their shores. They were zealots and also well-educated British gentlemen, which set the tone for what Andersen identifies as a distinctly American endeavor: propping up magical thinking with elaborate scientific proof.

In Andersen’s telling, you can easily trace the line from the self-appointed 17th-century prophet Anne Hutchinson to Kanye West: She was, he writes, uniquely American “because she was so confident in herself, in her intuitions and idiosyncratic, subjective understanding of reality,” a total stranger to self-doubt.

As he explains in what must have been an alarmingly self-confirming last chapter: Donald Trump is “stupendous Exhibit A” in the landscape of “Fantasyland,” a fitting leader for a nation that has, over the centuries, nurtured a “promiscuous devotion to the untrue.”

What turned the neurotic Presbyterian teenager into the great founder of the European Enlightenment?

your life might actually get better. Give up the prospect of life after death, and you will finally really appreciate life before it. Give up metaphysics, and you can concentrate on physics. Give up the idea of your precious, unique, irreplaceable self, and you might actually be more sympathetic to other people.

Go back to your backgammon game after your skeptical crisis, Hume wrote, and it will be exactly the same game.

Desideri retreated to an even more remote monastery. He worked on his Christian tracts and mastered the basic texts of Buddhism. He also translated the work of the great Buddhist philosopher Tsongkhapa into Italian.

That sure sounded like Buddhist philosophy to me—except, of course, that Hume couldn’t have known anything about Buddhist philosophy.

He spent the next five years in the Buddhist monasteries tucked away in the mountains around Lhasa. The monasteries were among the largest academic institutions in the world at the time. Desideri embarked on their 12-year-long curriculum in theology and philosophy. He composed a series of Christian tracts in Tibetan verse, which he presented to the king. They were beautifully written on the scrolls used by the great Tibetan libraries, with elegant lettering and carved wooden cases.

Desideri describes Tibetan Buddhism in great and accurate detail, especially in one volume titled “Of the False and Peculiar Religion Observed in Tibet.” He explains emptiness, karma, reincarnation, and meditation, and he talks about the Buddhist denial of the self.

The drive to convert and conquer the “false and peculiar” in the name of some metaphysical absolute was certainly there, in the West and in the East. It still is

For a long time, the conventional wisdom was that the Jesuits were retrograde enforcers of orthodoxy. But Feingold taught me that in the 17th century, the Jesuits were actually on the cutting edge of intellectual and scientific life. They were devoted to Catholic theology, of course, and the Catholic authorities strictly controlled which ideas were permitted and which were forbidden. But the Jesuit fathers at the Royal College knew a great deal about mathematics and science and contemporary philosophy—even heretical philosophy.

La Flèche was also startlingly global. In the 1700s, alumni and teachers from the Royal College could be found in Paraguay, Martinique, the Dominican Republic, and Canada, and they were ubiquitous in India and China. In fact, the sleepy little town in France was one of the very few places in Europe where there were scholars who knew about both contemporary philosophy and Asian religion.

Twelve Jesuit fathers had been at La Flèche when Desideri visited and were still there when Hume arrived. So Hume had lots of opportunities to learn about Desideri.One name stood out: P. Charles François Dolu, a missionary in the Indies. This had to be the Père Tolu I had been looking for; the “Tolu” in Petech’s book was a transcription error. Dolu not only had been particularly interested in Desideri; he was also there for all of Hume’s stay. And he had spent time in the East. Could he be the missing link?

in the 1730s not one but two Europeans had experienced Buddhism firsthand, and both of them had been at the Royal College. Desideri was the first, and the second was Dolu. He had been part of another fascinating voyage to the East: the French embassy to Buddhist Siam.

Dolu was an evangelical Catholic, and Hume was a skeptical Protestant, but they had a lot in common—endless curiosity, a love of science and conversation, and, most of all, a sense of humor. Dolu was intelligent, knowledgeable, gregarious, and witty, and certainly “of some parts and learning.” He was just the sort of man Hume would have liked.

Of course, it’s impossible to know for sure what Hume learned at the Royal College, or whether any of it influenced the Treatise. Philosophers like Descartes, Malebranche, and Bayle had already put Hume on the skeptical path. But simply hearing about the Buddhist argument against the self could have nudged him further in that direction. Buddhist ideas might have percolated in his mind and influenced his thoughts, even if he didn’t track their source

my quirky personal project reflected a much broader trend. Historians have begun to think about the Enlightenment in a newly global way. Those creaky wooden ships carried ideas across the boundaries of continents, languages, and religions just as the Internet does now (although they were a lot slower and perhaps even more perilous). As part of this new global intellectual history, new bibliographies and biographies and translations of Desideri have started to appear, and new links between Eastern and Western philosophy keep emerging.

It’s easy to think of the Enlightenment as the exclusive invention of a few iconoclastic European philosophers. But in a broader sense, the spirit of the Enlightenment, the spirit that both Hume and the Buddha articulated, pervades the story I’ve been telling.

as I read Buddhist philosophy, I began to notice something that others had noticed before me. Some of the ideas in Buddhist philosophy sounded a lot like what I had read in Hume’s Treatise. But this was crazy. Surely in the 1730s, few people in Europe knew about Buddhist philosophy

But the characters in this story were even more strongly driven by the simple desire to know, and the simple thirst for experience. They wanted to know what had happened before and what would happen next, what was on the other shore of the ocean, the other side of the mountain, the other face of the religious or philosophical—or even sexual—divide.

Like Dolu and Desideri, the gender-bending abbé and the Siamese astronomer-king, and, most of all, like Hume himself, I had found my salvation in the sheer endless curiosity of the human mind—and the sheer endless variety of human experience.

A closer look, however, would have revealed that individual journalists at BNN published lengthy stories as often as multiple times a minute, writing in generic prose familiar to anyone who has tinkered with the A.I. chatbot ChatGPT.

How easily the site and its mistakes entered the ecosystem for legitimate news highlights a growing concern: A.I.-generated content is upending, and often poisoning, the online information supply.

The websites, which seem to operate with little to no human supervision, often have generic names — such as iBusiness Day and Ireland Top News — that are modeled after actual news outlets. They crank out material in more than a dozen languages, much of which is not clearly disclosed as being artificially generated, but could easily be mistaken as being created by human writers.

Now, experts say, A.I. could turbocharge the threat, easily ripping off the work of journalists and enabling error-ridden counterfeits to circulate even more widely — as has already happened with travel guidebooks, celebrity biographies and obituaries.

The result is a machine-powered ouroboros that could squeeze out sustainable, trustworthy journalism. Even though A.I.-generated stories are often poorly constructed, they can still outrank their source material on search engines and social platforms, which often use A.I. to help position content. The artificially elevated stories can then divert advertising spending, which is increasingly assigned by automated auctions without human oversight.

NewsGuard, a company that monitors online misinformation, identified more than 800 websites that use A.I. to produce unreliable news content.

Low-paid freelancers and algorithms have churned out much of the faux-news content, prizing speed and volume over accuracy.

Former employees said they thought they were joining a legitimate news operation; one had mistaken it for BNN Bloomberg, a Canadian business news channel. BNN’s website insisted that “accuracy is nonnegotiable” and that “every piece of information underwent rigorous checks, ensuring our news remains an undeniable source of truth.”

this was not a traditional journalism outlet. While the journalists could occasionally report and write original articles, they were asked to primarily use a generative A.I. tool to compose stories, said Ms. Chakraborty and Hemin Bakir, a journalist based in Iraq who worked for BNN for almost a year. They said they had uploaded articles from other news outlets to the generative A.I. tool to create paraphrased versions for BNN to publish.

Mr. Chahal’s evangelism carried weight with his employees because of his wealth and seemingly impressive track record, they said. Born in India and raised in Northern California, Mr. Chahal made millions in the online advertising business in the early 2000s and wrote a how-to book about his rags-to-riches story that landed him an interview with Oprah Winfrey.

Mr. Chahal told Mr. Bakir to focus on checking stories that had a significant number of readers, such as those republished by MSN.com.Employees did not want their bylines on stories generated purely by A.I., but Mr. Chahal insisted on this. Soon, the tool randomly assigned their names to stories.

This crossed a line for some BNN employees, according to screenshots of WhatsApp conversations reviewed by The Times, in which they told Mr. Chahal that they were receiving complaints about stories they didn’t realize had been published under their names.

According to three journalists who worked at BNN and screenshots of WhatsApp conversations reviewed by The Times, Mr. Chahal regularly directed profanities at employees and called them idiots and morons. When employees said purely A.I.-generated news, such as the Fanning story, should be published under the generic “BNN Newsroom” byline, Mr. Chahal was dismissive.“When I do this, I won’t have a need for any of you,” he wrote on WhatsApp.Mr. Bakir replied to Mr. Chahal that assigning journalists’ bylines to A.I.-generated stories was putting their integrity and careers in “jeopardy.”

This was a strategy that Mr. Chahal favored, according to former BNN employees. He used his news service to exercise grudges, publishing slanted stories about a politician from San Francisco he disliked, Wikipedia after it published a negative entry about BNN Breaking and Elon Musk after accounts belonging to Mr. Chahal, his wife and his companies were suspended o

The increasing popularity of programmatic advertising — which uses algorithms to automatically place ads across the internet — allows A.I.-powered news sites to generate revenue by mass-producing low-quality clickbait content

Experts are nervous about how A.I.-fueled news could overwhelm accurate reporting with a deluge of junk content distorted by machine-powered repetition. A particular worry is that A.I. aggregators could chip away even further at the viability of local journalism, siphoning away its revenue and damaging its credibility by contaminating the information ecosystem.