Although the United States is currently the world's only military and economic superpower, the nation's superpower status may not last. The possible futures of the global system and the role of U.S. power are illuminated by careful study of the past. This book addresses the problems of conceptualizing and assessing hegemonic rise and decline in comparative and historical perspective. Several chapters are devoted to the study of hegemony in premodern world-systems. And several chapters scrutinize the contemporary position and trajectory of the United States in the larger world-system in comparison with the rise and decline of earlier great powers, such as the Dutch and British empires.