the U.S. strategy for defeating the Islamic State relies on a variety of regional allies and local armed groups who are often bitterly at odds. Though all of them regard the Islamic State as an enemy, most of them regard one another as enemies, too. As they conquer territory from the militants, they are staking out claims to the captured lands in ways that risk bringing them into conflict with others who are also seizing territory. New wars are brewing, for control of the post-Islamic State order.

WAR NO. 1: U.S.-backed Syrian Kurdish forces and Turkish-backed Arab forces This is one of the wars that have already started, and it is also one of the more complicated ones.

when Turkey intervened in Syria two weeks ago to help Syrian rebels capture Islamic State territory, it was clear that the Kurds were as much of a target as the Islamic State

To be fair, most of the people who labor in government or in the penumbra of foreign-policy institutions are patriotic, well-meaning, intelligent, and dedicated and sincerely believe in what they are doing. They want the United States to be secure and prosperous, and they would like to make the rest of the world a better place. And sometimes they do just that. But many of these people are also ambitious, and they are imbedded in a system that rewards conformity, rarely if ever questions the value of U.S. “global leadership,” and is quick to marginalize anyone who thinks America’s self-indulgent approach to foreign policy might be doing more harm than good.

Hillary Clinton is intimately connected to this community and cannot help being linked to its recent performance. By signing up all those experienced foreign-policy insiders, she reinforces her association with some of the good things the United States has done in recent years. But it also means that she owns the past 25 years of foreign-policy missteps

She has little choice but to defend the strategy of liberal hegemony pursued by all three post-Cold War presidents: If anything, she is more enthusiastic about it than President Barack Obama has been. Her problem is that this record is not easy to defend.