Courtesy Reuters

Would-be Cassandras have been predicting the imminent downfall of the American imperium ever since its inception. First came Sputnik and "the missile gap," followed by Vietnam, Soviet nuclear parity, and the Japanese economic challenge--a cascade of decline encapsulated by Yale historian Paul Kennedy's 1987 "overstretch" thesis.

The resurgence of U.S. economic and political power in the 1990s momentarily put such fears to rest. But recently, a new threat to the sustainability of U.S. hegemony has emerged: excessive dependence on foreign capital and growing foreign debt. As former Treasury Secretary Lawrence Summers has said, "there is something odd about the

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