THE COLD WAR NUCLEAR ARMS RACEThe United States, with Britain, developed atomic weapons during World War II and used them as a means to force Japan's early surrender. The first (and so far last) use of these weapons in hostilities came in August 1945 with the atomic bombings of Hiroshima and Nagasaki. By then the seeds of the Cold War were being sown as the two superpowers argued about the political reconstruction of postwar Europe. If the United States hoped that the Soviet Union would be sufficiently impressed by the destructive potential of a single bomb to become more conciliatory in its foreign policy, it was soon disappointed. Josef Stalin recognized that troops on the ground would determine the distribution of political influence in Europe and Asia, and he acted accordingly. By the time of Hiroshima he was already well informed about the American nuclear program, from sympathizers working within it, and he pushed forward with a Soviet program.