The modern era was the American century, but it was also very much the communist century. Between them, the United States and the Soviet Union held the fate of the world in their hands. If there was to be a just and durable peace after 1945, an understanding between Washington and Moscow would have to be its foundation. Instead, in a conflict quickly dubbed “the Cold War,” the world suffered through four decades of existential tension between the Soviets and the Americans. ‘Superpower’ explains why the Soviets and Americans moved from cooperating in a world war to resisting each other in the Cold War, before exploring the events and ending of the Cold War in the 1980s.