Americans are serial amnesiacs. And today, after more than 70 years of great-power peace and a quarter-century of unrivalled global supremacy, Americans have lost their sense of tragedy. The U.S.-led international order has been so successful, for so long, that Americans have come to take it for granted. They have forgotten what that order is meant to prevent in the first place: the sort of utter breakdown of the international system, the descent into violence and great-power war, that has been all too common throughout human history.

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