February 2023
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Following the end of the Cold War, it was not automatic that the United States would back NATO’s expansion into Central and Eastern Europe. Nevertheless, consistent support for NATO enlargement has become one of the central features of post-Cold War U.S. grand strategy for over three decades. What explains this trend, and what effects has it had for U.S. national security? Drawing from international relations (IR) theory and policy debates, this paper evaluates a series of hypotheses that might explain the United States’ sustained enthusiasm for NATO’s eastward march. Finding each argument wanting, it develops a synthetic explanation emphasizing the influence of unipolarity on American international opportunities and the effects this had on the course and content of post-Cold War U.S. foreign policy. It then assesses the mixed impact of NATO enlargement on U.S. national security, before discussing implications for policy, historiography, and theory.