Courtesy Reuters

Lawrence Summers, the dominant professor-politician of the Clinton years, used to say that the United States is history's only nonimperialist superpower. But is this claim anything to boast about today? The war on terrorism has focused attention on the chaotic states that provide profit and sanctuary to nihilist outlaws, from Sudan and Afghanistan to Sierra Leone and Somalia. When such power vacuums threatened great powers in the past, they had a ready solution: imperialism. But since World War II, that option has been ruled out. After more than two millennia of empire, orderly societies now refuse to impose their own

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