How can America be in decline and yet win the Cold War in 1989 and the Persian Gulf war in 1991? Because, as Henry R. Nau argues in this probing analysis of postwar policy, the Untied States, unlike the Soviet Union, shared power with its allies as it built a converging world community of political democracies and liberalized market. Today America leads that community as both the world's only military superpower and the one country Western governments...