In a book that brings a magisterial command of history to the most urgent of contemporary questions, two-time Pulitzer Prize-winning historian Arthur M. Schlesinger, Jr., explores the war in Iraq, the presidency, and the future of democracy. Describing unilateralism as the oldest doctrine in American history, Schlesinger nevertheless warns of the dangers posed by the fatal turn in U.S. policy from deterrence and containment to preventive war. He writes...