Hiroshima and Nagasaki.

Sources:

Harry Elmer Barnes, Perpetual War For Perpetual Peace: A Critical Examination of the Foreign Policy of Franklin Delano Roosevelt (New York: Greenwood Press, 1969);

Robert A. Dallek, Franklin D. Roosevelt and American Foreign Policy, 1932-1945 (New York: Oxford University Press, 1981);

Robert A. Divine, Roosevelt and World War II (Baltimore: Johns Hopkins Press, 1969);

Bruce M. Russett, No Clear and Present Danger (New York: Harper & Row, 1972);

C. L. Sulzberger, The American Heritage Picture History of World War II (New York: American Heritage Publishing House, 1966).