The presidency of Harry S. Truman began on April 12, 1945, when Harry S. Truman became President of the United States upon the death of Franklin D. Roosevelt, and ended on January 20, 1953. He had been Vice President of the United States for only 82 days when he succeeded to the presidency. Truman's presidency was a turning point in foreign affairs, as the United States engaged in an internationalist foreign policy and renounced isolationism. During his first year in office, Truman approved the atomic bombings of Hiroshima and Nagasaki and subsequently accepted the Surrender of Japan, which marked the end of World War II. In the aftermath of World War II, he helped establish the United Nations and other post-war institutions. In polls of historians and political scientists, Truman is generally ranked as one of the ten greatest presidents.
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