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The United States needs to prepare for a major war, not because its rival is rising but because of the opposite.

Why do great powers fight great wars? The conventional answer is a story of rising challengers and declining hegemons. An ascendant power, which chafes at the rules of the existing order, gains ground on an established power—the country that made those rules. Tensions multiply; tests of strength ensue. The outcome is a spiral of fear and hostility leading, almost inevitably, to conflict. “The growth of the power of Athens, and the alarm which this inspired in Sparta, made war inevitable,” the ancient historian Thucydides wrote—a truism now invoked, ad nauseum, in explaining the U.S.-China rivalry.

The idea of a Thucydides Trap, popularized by Harvard political scientist Graham Allison, holds that the danger of war will skyrocket as a surging China overtakes a sagging America. Even Chinese President Xi Jinping has endorsed the concept arguing Washington must make room for Beijing. As tensions between the United States and China escalate, the belief that the fundamental cause of friction is a looming “power transition”—the replacement of one hegemon by another—has become canonical.

The only problem with this familiar formula is that it’s wrong.

Continue reading at Foreign Policy.

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