U.S. national security policy is at a critically important crossroads. The Bush Doctrine of unilateralism, pre-emptive war, and the imposition of democracy by force has proven disastrous. The United States now finds itself vilified abroad, weakened at home, and bogged down in a seemingly endless and unwinnable war. In To Lead the World, Melvyn P. Leffler and Jeffrey W. Legro bring together eleven of America's most esteemed writers and thinkers...