Revolution and evolution

"This book provides a concise and instructive review of the revolutions of the twentieth century, with separate chapters on the Russian, Chinese, Guinea-Bissau, and Vietnamese revolutions, and examines the various currents of Marxism active in the revolutions of our times. A second section is devoted to the United States, and provides a survey of the class forces in American history as well as the authors' ideas on the objects and means of an American Revolution."--Publisher's web-site