The following article by Jessica T. Mathews will appear in the September 24, 2015 issue of the New York Review of Books, which goes on sale next week.

“The incoherence in American foreign policy has been growing for twenty-five years,” asserts Ian Bremmer. That’s a considerable overstatement, and from an expert in the field, but there is no question that, at home and abroad, American policies (from long before the current administration) evoke widespread angst, uncertainty, and criticism. Judging from a flurry of recent books, the most basic features of the US role abroad remain in question. How much should we try to do in rapidly changing circumstances? What are we actually able to do? How much should we spend abroad? Can’t a single principle be found to impose greater consistency on foreign policy?

Not only analysts and scholars are worried. I recently listened to a roomful of European leaders bemoan the lack of US commitment to NATO. Since the US accounts for twice as much of NATO members’ military spending (more than 70 percent) as all of its European members combined, this was a bit hard to fathom. Moreover, that commitment, and the lack of it in Europe, extends to the public. A recent poll of citizens of eight NATO countries by the Pew Research Center found that only in the US and Canada is a majority prepared to go to war if a NATO ally is attacked—that being the central requirement of the NATO treaty and the sine qua non of collective defense. So just why are Europeans worried about America?

In the Sunni Middle East fear of a US withdrawal is pervasive. Yet the US maintains dozens of bases and warships in and around the Persian Gulf—including major facilities and a substantial number of troops in Qatar, Kuwait, the United Arab Emirates, and Bahrain. Operations are also based in Jordan and Turkey. CENTCOM, the US Central Command, in charge of this region, has been the United States’ largest geographic command for many years. Yet a visitor to the region constantly hears that the day America will suddenly lose interest and depart is just around the corner. And in East Asia, governments from US allies to Beijing wonder whether America intends to remain the dominant Pacific power, whether the famous but still largely invisible “pivot” is about containing China, and what it might eventually mean if ever made real.

Read the full text in the New York Review of Books