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Harry S. Truman (May 8, 1884 â December 26, 1972) was the 33rd President of the United States (1945â53), an American politician of the Democratic Party.
Truman, who became president upon the death of President franklin d. roosevelt on April 12, 1945, made some of the most momentous decisions in U.S. history, including the dropping of atomic bombs on Hiroshima and Nagasaki, Japan, the rebuilding of Europe under the Marshall Plan, and the fighting of the Korean War.