Charles Kupchan is one of America's leading foreign policy intellectuals, and has produced an important book that cuts against the grain of Washington's contemporary military and economic triumphalism. In his book, Kupchan argues that the current political landscape -- including the end of the Cold War, the emergence of a significantly more competitive Europe, a waning interest among American citizens in foreign policy, a growing tendency toward U.S. unilateralism, and the profound impact of the digital age -- is leading to the end of an era of American global dominance.