In this 25th anniversary edition of the classic that demonstrated the role of population changes-such as rising youth cohorts, urbanization, shifting elite mobility--as causal factors of revolutions and rebellions, Jack A. Goldstone reflects on the history of revolutions in the last twenty-five years, from the Philippines and other color revolutions to the Arab Uprisings and the rise of the Islamic State. The new concluding chapter updates his major theory and looks to the future of revolutions in the Middle East, Asia, and Africa.