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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.
