Why did the U.S. assume a preeminent world role after World War II, & why has that role declined since the Vietnam War? An intellectual & cultural history of America's evolving status as a world power in the 20th century. Draws on the writings of intellectuals, speeches by politicians, periodicals, movies & TV, opinion polls, & other sources, White explores what America thought about power in the 20th century, how they evaluated America's world role & the confrontations of the Cold War, & how they perceived the erosion of this power after the Vietnam War. Identifies major trends in past American foreign policy & suggests possibilities for the prospects of international relations in the future.