Charles Kupchan. How Enemies Become Friends: The Sources of Stable Peace. Princeton: Princeton University Press, 2010, 2012. ISBN: 9780691142654 (cloth, $29.95); 9780691154381 (paper, $24.95). 9781400834419 (eBook, $24.95). Published by H-Diplo/ISSF on 25 October 2012Charles A. Kupchan has written an important book that poses fundamental questions for international relations scholars and policy makers: First, how do enemies in world politics become friends? Specifically, through what pathways can pairs or groups of states succeed in setting aside their geopolitical competition and construct enduring relationships that preclude the possibility of armed conflict? Second, when and why do enemies become friends (and vice versa)? In other words, under what circumstances are such zones of peace more likely to form and under what circumstances are they likely to dissolve?

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