Nuclear weapons are so central to the history of the Cold War that it can be difficult to disentangle the two. Did nuclear weapons cause the Cold War? Did they contribute to its escalation? Did they help to keep the Cold War “cold”? We should also ask how the Cold War shaped the development of atomic energy. Was the nuclear-arms race a product of Cold War tension rather than its cause?
The atomic bomb and the origins of the Cold War:
The nuclear age began before the Cold War. During World War II, three countries decided to build the atomic bomb: Britain, the United States, and the Soviet Union. Britain put its own work aside and joined the Manhattan Project as a junior partner in 1943. The Soviet effort was small before August 1945. The British and American projects were driven by the fear of a German atomic bomb, but Germany decided in 1942 not to make a serious effort to build the bomb. In an extraordinary display of scientific and industrial might, the United States made two bombs ready for use by August 1945. Germany was defeated by then, but President Harry S. Truman decided to use the bomb against Japan.
The decision to use the atomic bomb has been a matter of intense controversy. Did Truman decide to bomb Hiroshima and Nagasaki in order, as he claimed, to end the war with Japan without further loss of American lives? Or did he drop the bombs in order to intimidate the Soviet Union, without really needing them to bring the war to an end? His primary purpose was surely to force Japan to surrender, but he also believed that the bomb would help him in his dealings with Iosif V. Stalin. That latter consideration was secondary, but it confirmed his decision. Whatever Truman’s motives, Stalin regarded the use of the bomb as an anti-Soviet move, designed to deprive the Soviet Union of strategic gains in the Far East and more generally to give the United States the upper hand in defining the postwar settlement. On August 20, 1945, two weeks to the day after Hiroshima, Stalin signed a decree setting up a Special Committee on the Atomic Bomb, under the chairmanship of Lavrentii P. Beriia. The Soviet project was now a crash program.