Over the last two centuries, prominent Americans have described the United States as an "empire of liberty," a "shining city on a hill," the "last best hope of Earth," the "leader of the free world," and the "indispensable nation." These enduring tropes explain why all presidential candidates feel compelled to offer ritualistic paeans to America's greatness and why President Barack Obama landed in hot water -- most recently, from Mitt Romney -- for saying that while he believed in "American exceptionalism," it was no different from "British exceptionalism," "Greek exceptionalism," or any other country's brand of patriotic chest-thumping.
Most statements of "American exceptionalism" presume that America's values, political system, and history are unique and worthy of universal admiration. They also imply that the United States is both destined and entitled to play a distinct and positive role on the world stage.
The only thing wrong with this self-congratulatory portrait of America's global role is that it is mostly a myth. Although the United States possesses certain unique qualities -- from high levels of religiosity to a political culture that privileges individual freedom -- the conduct of U.S. foreign policy has been determined primarily by its relative power and by the inherently competitive nature of international politics. By focusing on their supposedly exceptional qualities, Americans blind themselves to the ways that they are a lot like everyone else.
This unchallenged faith in American exceptionalism makes it harder for Americans to understand why others are less enthusiastic about U.S. dominance, often alarmed by U.S. policies, and frequently irritated by what they see as U.S. hypocrisy, whether the subject is possession of nuclear weapons, conformity with international law, or America's tendency to condemn the conduct of others while ignoring its own failings. Ironically, U.S. foreign policy would probably be more effective if Americans were...