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...