"Why do Britain, France, and Italy provide or refuse military support for U.S.-led uses of force? This book provides a unique, multiple-case study analysis of transatlantic burden-sharing. Sixty original interviews with top policymakers and analysts provide insight into allies' decisions regarding the Kosovo War (1999), Afghanistan (2001), and the Iraq War (2003). The cases show that neoclassical realist factors--alliance value, threat, prestige, and electoral politics--explain allies' decisions better than constructivist factors--identity and norms. The book briefly covers additional cases (Vietnam, Lebanon, the Persian Gulf War, Somalia) and concludes with recommendations for increasing future allied military support"--Provided by publisher.