Liberal advocates of a multilateralist, rules-based, post-sovereign foreign policy have recently been having their noses ground in the grim fact of great power rivalry. Robert Kagan first called attention to renascent great-power politics a decade ago in "End of Dreams, Return of History," with its blunt opening line, "The world has become normal again." In the last few years, the realists - including Henry Kissinger in his 2014 book, "World Order," Hal Brands, and Foreign Policy's own Stephen M. Walt - have had a field day at the expense of idealists who, they said, had persuaded themselves that the end of history had arrived.
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