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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.
Harry Truman (1884-1972), the 33rd U.S. president, assumed office following the death of President Franklin Roosevelt (1882-1945). In the White House from 1945 to 1953, Truman made the decision to use the atomic bomb against Japan, helped rebuild postwar Europe, worked to contain communism and led the United States into the Korean War (1950-1953).