Book excerpt: "In the 20th and 21st century revolutions have become more urban, often less violent, but also more frequent and more transformative of the international order. Whether it is the revolutions against Communism in Eastern Europe and the USSR; the "color revolutions" across Asia, Europe and North Africa; or the religious revolutions in Iran, Afghanistan, and Syria; today's revolutions are quite different from those of the past. Modern theories of revolution have therefore replaced the older class-based theories with more varied, dynamic, and contingent models of social and political change. This new edition updates the history of revolutions, from Classical Greece and Rome to the Revolution of Dignity in the Ukraine, with attention to the changing types and outcomes of revolutionary struggles. It also presents the latest advances in the theory of revolutions, including the issues of revolutionary waves, revolutionary leadership, international influences, and the likelihood of revolutions to come. This volume provides a brief but comprehensive introduction to the nature of revolutions and their role in global history"--