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The documents also raise new questions about Facebook, which is already grappling with intense criticism over the spread of Russian propaganda and fake news. The data Cambridge collected from profiles, a portion of which was viewed by The Times, included details on users’ identities, friend networks and “likes.”

“Protecting people’s information is at the heart of everything we do,” Mr. Grewal said. “No systems were infiltrated, and no passwords or sensitive pieces of information were stolen or hacked.”Still, he added, “it’s a serious abuse of our rules.”

The group experimented abroad, including in the Caribbean and Africa, where privacy rules were lax or nonexistent and politicians employing SCL were happy to provide government-held data, former employees said.

Mr. Nix and his colleagues courted Mr. Mercer, who believed a sophisticated data company could make him a kingmaker in Republican politics, and his daughter Rebekah, who shared his conservative views. Mr. Bannon was intrigued by the possibility of using personality profiling to shift America’s culture and rewire its politics, recalled Mr. Wylie and other former employees, who spoke on the condition of anonymity because they had signed nondisclosure agreements.

Mr. Wylie’s team had a bigger problem. Building psychographic profiles on a national scale required data the company could not gather without huge expense. Traditional analytics firms used voting records and consumer purchase histories to try to predict political beliefs and voting behavior.

But those kinds of records were useless for figuring out whether a particular voter was, say, a neurotic introvert, a religious extrovert, a fair-minded liberal or a fan of the occult. Those were among the psychological traits the firm claimed would provide a uniquely powerful means of designing political messages.

Mr. Wylie found a solution at Cambridge University’s Psychometrics Centre. Researchers there had developed a technique to map personality traits based on what people had liked on Facebook. The researchers paid users small sums to take a personality quiz and download an app, which would scrape some private information from the their profiles and those of their friends, activity that Facebook permitted at the time. The approach, the scientists said, could reveal more about a person than their parents or romantic partners knew — a claim that has been disputed.

When the Psychometrics Centre declined to work with the firm, Mr. Wylie found someone who would: Dr. Kogan, who was then a psychology professor at the university and knew of the techniques. Dr. Kogan built his own app and in June 2014 began harvesting data for Cambridge Analytica. The business covered the costs — more than $800,000 — and allowed him to keep a copy for his own research, according to company emails and financial records.

He ultimately provided over 50 million raw profiles to the firm, Mr. Wylie said, a number confirmed by a company email and a former colleague. Of those, roughly 30 million contained enough information, including places of residence, that the company could match users to other records and build psychographic profiles. Only about 270,000 users — those who participated in the survey — had consented to having their data harvested.Image

Under the guidance of Brad Parscale, Mr. Trump’s digital director in 2016 and now the campaign manager for his 2020 re-election effort, Cambridge performed a variety of services, former campaign officials said. That included designing target audiences for digital ads and fund-raising appeals, modeling voter turnout, buying $5 million in television ads and determining where Mr. Trump should travel to best drum up support.

“We wanted as much as we could get,” he acknowledged. “Where it came from, who said we could have it — we weren’t really asking.”

The firm was effectively a shell. According to the documents and former employees, any contracts won by Cambridge, originally incorporated in Delaware, would be serviced by London-based SCL and overseen by Mr. Nix, a British citizen who held dual appointments at Cambridge Analytica and SCL. Most SCL employees and contractors were Canadian, like Mr. Wylie, or European.

In a memo to Mr. Bannon, Ms. Mercer and Mr. Nix, the lawyer, then at the firm Bracewell & Giuliani, warned that Mr. Nix would have to recuse himself “from substantive management” of any clients involved in United States elections. The data firm would also have to find American citizens or green card holders, Mr. Levy wrote, “to manage the work and decision making functions, relative to campaign messaging and expenditures.”

In summer and fall 2014, Cambridge Analytica dived into the American midterm elections, mobilizing SCL contractors and employees around the country. Few Americans were involved in the work, which included polling, focus groups and message development for the John Bolton Super PAC, conservative groups in Colorado and the campaign of Senator Thom Tillis, the North Carolina Republican.

While Cambridge hired more Americans to work on the races that year, most of its data scientists were citizens of the United Kingdom or other European countries, according to two former employees.

Mr. Wylie said the Facebook data was “the saving grace” that let his team deliver the models it had promised the Mercers.

Mr. Grewal, the Facebook deputy general counsel, said in a statement that both Dr. Kogan and “SCL Group and Cambridge Analytica certified to us that they destroyed the data in question.”

But copies of the data still remain beyond Facebook’s control. The Times viewed a set of raw data from the profiles Cambridge Analytica obtained.

While Mr. Nix has told lawmakers that the company does not have Facebook data, a former employee said that he had recently seen hundreds of gigabytes on Cambridge servers, and that the files were not encrypted.

Today, as Cambridge Analytica seeks to expand its business in the United States and overseas, Mr. Nix has mentioned some questionable practices. This January, in undercover footage filmed by Channel 4 News in Britain and viewed by The Times, he boasted of employing front companies and former spies on behalf of political clients around the world, and even suggested ways to entrap politicians in compromising situations.

Mr. Nix is seeking to take psychographics to the commercial advertising market. He has repositioned himself as a guru for the digital ad age — a “Math Man,” he puts it. In the United States last year, a former employee said, Cambridge pitched Mercedes-Benz, MetLife and the brewer AB InBev, but has not signed them on.

Mr. Wylie found a solution at Cambridge University’s Psychometrics Centre. Researchers there had developed a technique to map personality traits based on what people had liked on Facebook. The researchers paid users small sums to take a personality quiz and download an app, which would scrape some private information from their profiles and those of their friends, activity that Facebook permitted at the time. The approach, the scientists said, could reveal more about a person than their parents or romantic partners knew

The impacts of technological change take their time appearing. They also vary hugely from industry to industry. Although in many simple economic models technology pairs neatly with capital and labour to produce output, in practice technological changes do not affect all workers the same way. Some find that their skills are complementary to new technologies. Others find themselves out of work.

The case for a highly disruptive period of economic growth is made by Erik Brynjolfsson and Andrew McAfee, professors at MIT, in “The Second Machine Age”, a book to be published later this month. Like the first great era of industrialisation, they argue, it should deliver enormous benefits—but not without a period of disorienting and uncomfortable change

Their argument rests on an underappreciated aspect of the exponential growth in chip processing speed, memory capacity and other computer metrics: that the amount of progress computers will make in the next few years is always equal to the progress they have made since the very beginning. Mr Brynjolfsson and Mr McAfee reckon that the main bottleneck on innovation is the time it takes society to sort through the many combinations and permutations of new technologies and business models.

A startling progression of inventions seems to bear their thesis out. Ten years ago technologically minded economists pointed to driving cars in traffic as the sort of human accomplishment that computers were highly unlikely to master. Now Google cars are rolling round California driver-free

Even after computers beat grandmasters at chess (once thought highly unlikely), nobody thought they could take on people at free-form games played in natural language. Then Watson, a pattern-recognising supercomputer developed by IBM, bested the best human competitors in America’s popular and syntactically tricksy general-knowledge quiz show “Jeopardy!” Versions of Watson are being marketed to firms

Text-mining programs will displace professional jobs in legal services. Biopsies will be analysed more efficiently by image-processing software than lab technicians. Accountants may follow travel agents and tellers into the unemployment line as tax software improves. Machines are already turning basic sports results and financial data into good-enough news stories.

A taxi driver will be a rarity in many places by the 2030s or 2040s. That sounds like bad news for journalists who rely on that most reliable source of local knowledge and prejudice—but will there be many journalists left to care? Will there be airline pilots? Or traffic cops? Or soldiers?

Tyler Cowen, an economist at George Mason University and a much-read blogger, writes in his most recent book, “Average is Over”, that rich economies seem to be bifurcating into a small group of workers with skills highly complementary with machine intelligence, for whom he has high hopes, and the rest, for whom not so much.

the second machine age will make such trial and error easier. It will be shockingly easy to launch a startup, bring a new product to market and sell to billions of global consumers (see article). Those who create or invest in blockbuster ideas may earn unprecedented returns as a result.

Thomas Piketty, an economist at the Paris School of Economics, argues along similar lines that America may be pioneering a hyper-unequal economic model in which a top 1% of capital-owners and “supermanagers” grab a growing share of national income and accumulate an increasing concentration of national wealth

The rise of the middle-class—a 20th-century innovation—was a hugely important political and social development across the world. The squeezing out of that class could generate a more antagonistic, unstable and potentially dangerous politics.

The current doldrum in wages may, like that of the early industrial era, be a temporary matter, with the good times about to roll (see chart 3). These jobs may look distinctly different from those they replace. Just as past mechanisation freed, or forced, workers into jobs requiring more cognitive dexterity, leaps in machine intelligence could create space for people to specialise in more emotive occupations, as yet unsuited to machines: a world of artists and therapists, love counsellors and yoga instructors.

though growth in areas of the economy that are not easily automated provides jobs, it does not necessarily help real wages. Mr Summers points out that prices of things-made-of-widgets have fallen remarkably in past decades; America’s Bureau of Labour Statistics reckons that today you could get the equivalent of an early 1980s television for a twentieth of its then price,

owever, prices of things not made of widgets, most notably college education and health care, have shot up

As innovation continues, automation may bring down costs in some of those stubborn areas as well, though those dominated by scarcity—such as houses in desirable places—are likely to resist the trend, as may those where the state keeps market forces at bay. But if innovation does make health care or higher education cheaper, it will probably be at the cost of more jobs, and give rise to yet more concentration of income.

Adaptation to past waves of progress rested on political and policy responses. The most obvious are the massive improvements in educational attainment brought on first by the institution of universal secondary education and then by the rise of university attendance. Policies aimed at similar gains would now seem to be in order. But as Mr Cowen has pointed out, the gains of the 19th and 20th centuries will be hard to duplicate.

Boosting the skills and earning power of the children of 19th-century farmers and labourers took little more than offering schools where they could learn to read, write and do algebra. Pushing a large proportion of college graduates to complete graduate work successfully will be harder and more expensive. Perhaps cheap and innovative online education will indeed make new attainment possible. But as Mr Cowen notes, such programmes may tend to deliver big gains only for the most conscientious students.

Everyone should be able to benefit from productivity gains—in that, Keynes was united with his successors. His worry about technological unemployment was mainly a worry about a “temporary phase of maladjustment” as society and the economy adjusted to ever greater levels of productivity

However, society may find itself sorely tested if, as seems possible, growth and innovation deliver handsome gains to the skilled, while the rest cling to dwindling employment opportunities at stagnant wages.

For 30 wonderful years, we had been unusually flush, and we got used to it, re-designing our institutions to assume unending increases in subsidized demand. This did not happen. The year it started not happening was 1975. Every year since, we tweaked our finances, hiking tuition a bit, taking in a few more students, making large lectures a little larger, hiring a few more adjuncts.

Over the decades, though, we’ve behaved like an embezzler who starts by taking only what he means to replace, but ends up extracting so much that embezzlement becomes the system. There is no longer enough income to support a full-time faculty and provide students a reasonably priced education of acceptable quality at most colleges or universities in this country.

Of the twenty million or so students in the US, only about one in ten lives on a campus. The remaining eighteen million—the ones who don’t have the grades for Swarthmore, or tens of thousands of dollars in free cash flow, or four years free of adult responsibility—are relying on education after high school not as a voyage of self-discovery but as a way to acquire training and a certificate of hireability.

Though the landscape of higher education in the U.S., spread across forty-six hundred institutions, hosts considerable variation, a few commonalities emerge: the bulk of students today are in their mid-20s or older, enrolled at a community or commuter school, and working towards a degree they will take too long to complete. One in three won’t complete, ever. Of the rest, two in three will leave in debt. The median member of this new student majority is just keeping her head above water financially. The bottom quintile is drowning.

One obvious way to improve life for the new student majority is to raise the quality of the education without raising the price. This is clearly the ideal, whose principal obstacle is not conceptual but practical: no one knows how. The value of our core product—the Bachelor’s degree—has fallen in every year since 2000, while tuition continues to increase faster than inflation.

The metaphor my colleagues often use invokes religion. In Wannabe U, the author describes the process of trying to turn UConn into a nationally competitive school as the faculty being ‘dechurched’. In this metaphor, we are a separate estate of society that has putative access to its resources, as well as the right to reject democratic oversight, managerial imperatives, and market discipline. We answer to no one but ourselves.

When the economic support from the Golden Age began to crack, we tenured faculty couldn’t be forced to share much of the pain. Our jobs were secure, so rather than forgo raises or return to our old teaching loads, we either allowed or encouraged those short-term fixes—rising tuition, larger student bodies, huge introductory lectures.

All that was minor, though, compared to our willingness to rely on contingent hires, including our own graduate students, ideal cheap labor. The proportion of part-time and non-tenure track teachers went from less than half of total faculty, before 1975, to over two-thirds now

In the same period, the proportion of jobs that might someday lead to tenure collapsed, from one in five to one in ten. The result is the bifurcation we have today: People who have tenure can’t lose it. People who don’t mostly can’t get it.

If we can’t keep raising costs for students (we can’t) and if no one is coming to save us (they aren’t), then the only remaining way to help these students is to make a cheaper version of higher education for the new student majority.

The number of high-school graduates underserved or unserved by higher education today dwarfs the number of people for whom that system works well. The reason to bet on the spread of large-scale low-cost education isn’t the increased supply of new technologies. It’s the massive demand for education, which our existing institutions are increasingly unable to handle. That demand will go somewhere.

why is not part of the answer a secondary education certification scheme that is serious and ideally nation-wide. The British GCSE/A-levels is something that seems to work. Herding the cats that would be necessary to implement something like that is, I grant, a monstrous task, but perhaps no more difficult than revising the university system. As things stand now, the lack of standards in most high schools means wasted opportunities of academic development for a very large part of our reasonably gifted teenage population. A revised university system would still leave in place the distinctly inadequate high school system we have now.

The other way to help these students would be to dramatically reduce the price or time required to get an education of acceptable quality (and for acceptable read “enabling the student to get a better job”, their commonest goal.) This is a worse option in every respect except one, which is that it may be possible.

The metaphor I have come to prefer (influenced especially by Richard Rorty) is that we in the academy are workers, and our work is to make people smarter — ourselves, our peers, our students, which is a goal that has to be constantly negotiated among various constituencies.

When the military rationale for both the GI Bill and the Soviet struggle ended, so did overall American interest in the kind of funding that drove the Golden Age. There is not now and has never been a broad commitment to higher education as a social good in this country

ow you can say — and many of my colleagues do — that this is all just a matter of getting state governments to take on different concerns or convictions, or getting a more nationalized educational system. That was the song my parents, both educators, sang, and the song I grew up singing. But the period when the states really drove funding up lasted just 15 years — 1960 to 1975 — and has been in decline for 40 years since.

I can — barely — imagine some states increasing some subsidies to some campuses at a rate faster than inflation. Some of the schools in California, Virginia, Massachusetts, and Michigan are candidates for this. I cannot, however, imagine my tenured colleagues tolerating the situation that makes higher education broadly affordable in social democracies, which would require us earning less while teaching more.

I am done, in other words, thinking of myself and my peers on faculty as blameless, and I am done imagining that 40 years of evidence from the behavior of democratically elected legislatures is some sort of readily reversible blip. I do not believe that the caste system that has established itself at elite institutions can be funded at the rate which we insist we need, and I do not believe that we will willingly see any of our own benefits reduced to help our junior colleagues or our students.

Students feel compelled to acquire credentialing as a means of improving their economic positions. Unfortunately, along the way, “professional” training has taken precedence over education. The two have become conflated in the public mind.

Today it is not only that the PhD:s are abundant but also that in many areas peak knowledge is short lived. You might be competent when you graduate but five years later that competence is of yesteryear and the ones with the newest knowledge kick you out just like you kicked someone else out five years ago. We need a base to stand on but then we need to go in and out of education during our whole lives to keep up with development. This puts a strain on each end everyone of us as individuals but it also calls for a whole new role for academia

Change the game and lower the transaction costs: Instead of treating students as backseat passengers in a higher educational vehicle that’s geared towards the transmission of self-contained content, i.e., content produced by professors for the self-serving purpose of publication–put steering wheels in the hands of students, take them out on road trips, negotiate real problems–and they will become self-educating

Note that having a college degree only retains value right now because there isn’t a better (more predictive, and trusted) credential to be had for people who are seeking jobs.

the online versions of education have reduced the college experience down to what’s easy to implement and easy to measure: receiving lectures, and activities of the quiz-and-test variety. It’s not clear that the value of the traditional old-school college experience (and it’s accompanying degree) were the result of those particular aspects of the experience. Granting degrees based only on coursework runs the risk of diluting the perceived value of the degree.

classes were videotaped. This was not a vestige of Soviet surveillance. Rather, he wanted to critique how teachers interacted with — and nurtured relations between — children. Bogin and his staff often worked late into the night, reviewing footage and discussing methodology.

Life at New Humanitarian was full of academic Olympiads, poetry-reciting contests and quiz bowls. The school stressed oral exams, even in math, where children had to solve an equation at the blackboard and explain methodology.

Children were graded and ranked, with results posted. We were not accustomed to this: in Brooklyn, the school instilled an everyone’s-a-winner ethos. At New Humanitarian, Danya says, “they send an entirely different message to the kids: ‘Learning is hard, but you have to do it. You have to get good grades.’ ”

Danya, now nearly 14, was ambivalent about leaving, drawn toward being a teenager in New York City. But Arden and Emmett would have gladly stayed. “I feel like I’m tugged in two ways, and I have no idea what to do,” Arden told me last spring. “That’s the one problem with living abroad. You end up getting those weird feelings like, Oh, I can’t leave; I can’t stay.”

One of the two major causes of distress, Luthar found, was the “pressure to excel at multiple academic and extracurricular pursuits.”

From their answers, Luthar constructed a profile of elite American adolescents whose self-worth is tied to their achievements and who see themselves as catastrophically flawed if they don’t meet the highest standards of success.

Middle-class kids, she told me, generally do not live with the expectation that they should go to Stanford or earn $200,000 a year. “If I’ve never been to the moon,” she said of middle-class families, “why would I expect my kids to go there?” The yardstick for the children of the meritocratic elite is different, and it can intimidate as much as it can empower.

The second major cause of distress that Luthar identified was perhaps more surprising: Affluent kids felt remarkably isolated from their parents.

The kids in the affluent communities she studied felt their parents to be no more available to them, either emotionally or physically, than the kids in severe poverty did.

Some of the measures Luthar used were objective: Did the family eat dinner together, or hang out in the evenings? Here, she discovered that some busy parents would leave adolescents alone in the afternoon and evening and often weren’t home at all during those hours

Children had the sense that their parents monitored their activities and cared deeply about how they were spending their time, but that didn’t translate into feeling close. Many children felt they were being prodded toward very specific goals and behaviors by parental cues, some subtle, some less so.

a feeling of closeness to parents was inversely linked to household income, meaning that the most-affluent kids felt the most alienated.

In the past couple of years, other best sellers have sounded a similar note. William Deresiewicz, a former Yale professor who contributes to this magazine, argues in Excellent Sheep that elite education “manufactures students who are smart and talented and driven, yes, but also anxious, timid, and lost, with little intellectual curiosity and a stunted sense of purpose.”

But it turns out that this combination can be just as hard on a child’s well-being.

Since Levine wrote The Price of Privilege, she’s watched the stress in the Bay Area and in affluent communities all over the country become more pervasive and more acute.

Now, she reports, the teenagers have no sense of agency. They still complain bitterly about all the same things, but they feel they have no choice.

Many have also fallen prey to what Levine calls a “mass delusion” that there is but one path to a successful life, and that it is very narrow

Adolescents no longer typically identify parents or peers as the greatest source of their stress, Levine says. They point to school. But that itself may suggest a submission of sorts—the unquestioned adoption of parental norms.

Starting in seventh grade, the rich cohort includes just as many kids who display troubling levels of delinquency as the poor cohort, although the rule-breaking takes different forms. The poor kids, for example, fight and carry weapons more frequently, which Luthar explains as possibly self-protective. The rich kids, meanwhile, report higher levels of lying, cheating, and theft.

The meeting she attended with select parents, scholars, mental-health professionals, and community leaders was academically rigorous and yielded many important insights. But it was “eerie” in its almost complete lack of feeling

“There are a lot of very hard truths that are just not being spoken.”

Gunn is more than 40 percent Asian, and some non-Asian parents, particularly ones who’d grown up in town when the Asian population was smaller, felt the shift was poisoning the culture of the entire school.

Her first semester, Chiu got an F on a geometry test, which “totally traumatized me.” Her relationship with her parents started to fray, “because it just took too much energy to speak in a polite tone of voice.” She began to dread swim practice and even Girl Scouts and band, “but I didn’t want to be a quitter.” She remembers wishing that someone had broken up with her, or that she was anorexic, or that she had some reason to explain to her parents why she felt so sad. “I also felt like I was already saying that I was too stressed, and nobody—neither my parents nor my teachers—seemed to care or take me seriously.

well-educated parents are quick to distance themselves from the Tiger Mom. We might admire her children’s accomplishments, but we tend to believe these can be coaxed out of a child through applause, not scolding. In fact, this particular combination of lavish praise and insistence on achievement defines our era of protective, meritocratic parenting

In March, after spending two days among Palo Alto’s parents and civic leaders, Luthar came to see the community, still in shock over the suicides, as hovering somewhere between fear and denial.

Providing praise and love when a child performs especially well can look like healthy parenting, he says, because the parents are giving the child more of a good thing. But if praise comes only when a child succeeds, the child is likely to develop a sense that his or her parents’ affection depends upon good grades, or touchdowns, or mastery of a religious text, or whatever the parents’ priorities might be.

The aim of healthy parenting, Assor says, should not be to shower children only with praise and trophies, or to encourage self-esteem based on no real achievements. It should be to disentangle love from the project of parental or pedagogical guidance

Giving specific, positive feedback about something a child has tried hard at, or critical yet constructive feedback when a child fails, is perfectly appropriate. “But being warm and nice is a different matter,” he says. “We want to be nice and warm also when our kids do not achieve and when they do not try hard to achieve.”

The hope is that, secure in love, a child can experiment more freely and begin to find his or her own voice.

With the help of therapists and time, Chiu could better explain what she had experienced—depression, the dangers of not sleeping enough. She learned that her idea that she could escape by manufacturing a mental-health crisis was itself a sign of a mental-health crisis.

Not atypically for people who come to consider suicide, she’d lost her ability to think clearly or solve problems, and ended up trapped in a tunnel ruminating about escape, until self-destruction became the only light she could see.

Almost by definition, suicide points to underlying psychological vulnerability. The thinking behind it is often obsessive and then impulsive; a kid can be ruminating about the train for a long time and then one night something ordinary—a botched quiz, a breakup—leads him or her to the tracks.

the closer I got to the heart of this story, the less I felt I understood that link. Some details neatly fit the narrative that academic pressure has caused lethal amounts of stress in Palo Alto—Taylor Chiu’s experience, for example. Will Dickens, who died in 2009, had a learning disability, and his mother, Janet Dixon-Dickens, told me he never forgot it at Gunn. Cameron Lee, on the other hand, wasn’t obviously oppressed by schoolwork, and neither was J.P. Blanchard, or Sonya Raymakers, a girl who died in June 2009, soon after being accepted into her dream program at New York University.

In these days of assumed meritocracy, where children can be turned into anything, we admire them as displays of remarkable engineering, to be tweaked and fine-tuned into bilingual perfection. What we’ve lost, perhaps, is a sense that there may be things about them we can’t know or understand, and that that mysterious quality, separate from us, is what we should marvel at.

Admitting we don’t entirely know why teenagers kill themselves isn’t an invitation to do nothing to prevent it from happening. It’s just a call for humility, a short pause to acknowledge that a sense of absolute certainty about what children should do or be or how they should operate is part of what landed us here.

He had been preparing for his run at “Jeopardy!” for a long time. A really long time. Holzhauer said he had dreamed of being on the show since he was a kid, back when the Chicago Cubs and “Jeopardy!” were about the only two things his family watched on school nights.

He had always been somewhat of a whiz kid. In high school in Naperville, a western suburb of Chicago, he was part of a team that won the Worldwide Youth in Science and Engineering state competition. He placed first in physics and second in mathematics — a background that would come in handy when “Physics Terms” was the Final Jeopardy category on Tuesday.

“I think it was a huge advantage that I don’t blink at gambling large amounts of money when I think I have a big edge,” he said. “I approach both sports betting and ‘Jeopardy!’ with the same attitude: What can I do differently than the average person to give myself an edge?”

It could be that he reads children’s books. It could also be his rigorous training watching back-to-back reruns of “Jeopardy!” on DVR for hours at a time — while standing in dress shoes, just so it feels real.

The findings suggest that political efforts to cut welfare programs are driven less by conservative principles than by racial anxiety, the authors conclude

Those results show that the push to cut welfare programs is not driven by pure political motives, such as decreasing government spending or shrinking government bureaucracy, Wetts said.

Between 2008 and 2012 in particular, they found, opposition to welfare rose among all Americans -- but far more sharply among whites, who also began scoring higher on racial resentment scales during that period

These trends weren’t necessarily linked, however. So to determine if there was a connection, Wetts and Willer designed two more experiments: one in which they quizzed respondents on their feelings about welfare after seeing a graph about U.S. demographic change, and another in which respondents took a similar quiz after viewing information on average income by race and the demographics of welfare beneficiaries.

White Americans called for deeper cuts to welfare programs after viewing charts that showed they would become a racial minority within 50 years. They also opposed welfare programs more when they were told that people of color benefit most from them.

“My main hope here is that people take a step back, look at what these sorts of programs do for the poor, and think about what’s driving opposition to them.”

“We find evidence that these shifts [in sentiment against welfare programs] are specifically directed at programs people see as benefiting minorities instead of whites,” she added.

Wetts isn’t ruling out the possibility that alternate factors could also be at play, of course. Some researchers have found that people embrace more conservative politics during periods of rapid social change -- not necessarily because they fear their racial status is threatened, but because they fear change is happening too fast

Researchers have also shown that white Americans' racial prejudice affects their views on everything from healthcare policy to the death penalty to dogs

On the same day Wetts' paper published, a separate study in the journal Environmental Politics found that people with high levels of "racial resentment" are more likely to believe that the scientific consensus on climate change is false.

"More and more, white Americans use their racial attitudes to help them decide their positions on political questions such as whom to vote for or what stance to take on important issues including welfare and health care."

The Trump administration has begun allowing states to impose work requirements on Medicaid recipients, and has proposed tripling the rents for the poorest households receiving federal housing assistance. The House is also scheduled to vote again next month on a plan to cut $9 billion from food-stamp benefits over 10 years and require most adults to hold a job  to receive payments.

Figures from the federal government and the Kaiser Family Foundation show that white Americans make up 36 percent of food-stamp recipients, 43 percent of Medicaid recipients and 28 percent of recipients for cash welfare.

Facebook’s app will also look different on Tuesday. To prevent candidates from prematurely and inaccurately declaring victory, the company plans to add a notification at the top of News Feeds letting people know that no winner has been chosen until election results are verified by news outlets like Reuters and The Associated Press

After the polls close, Facebook plans to suspend all political ads from circulating on the social network and its photo-sharing site

Twitter has also worked to combat misinformation since 2016, in some cases going far further than Facebook. Last year, for instance, it banned political advertising entirely, saying the reach of political messages “should be earned, not bought.”

In October, Twitter began experimenting with additional techniques to slow the spread of misinformation.

In September, Twitter added an Election Hub that users can use to look for curated information about polling, voting and candidates.

Twitter plans to add labels to tweets from candidates who claim victory before the election is called by authoritative sources.

Twitter will eventually allow people to retweet again without prompting them to add their own context. But many of the changes for the election — like the ban on political ads and the fact-checking labels — are permanent

For Google’s YouTube, it wasn’t the 2016 election that sounded a wake-up call about the toxic content spreading across its website. That moment came in 2017 when a group of men drove a van into pedestrians on London Bridge after being inspired by YouTube videos of inflammatory sermons from an Islamic cleric.

It has overhauled its policies to target misinformation, while tweaking its algorithms to slow the spread of what it deems borderline content — videos that do not blatantly violate its rules but butt up against them.

On Tuesday, Mr. Mohan plans to check in regularly with his teams to keep an eye on anything unusual, he said. There will be no “war room,” and he expects that most decisions to keep or remove videos will be clear and that the usual processes for making those decisions will be sufficient.

Starting on Tuesday and continuing as needed, YouTube will display a fact-check information panel above election-related search results and below videos discussing the results, the company said.