Harry S. Truman (allthetropes.org)
Finding himself President after the sudden death of Franklin D. Roosevelt, Harry S. Truman was President until 1953. As such, it was Truman who gave the order to drop the atomic bombs on Hiroshima and Nagasaki. Truman did not have the “need to know” about the Manhattan Project until FDR died (hell, Josef Stalin and his spies knew about the Manhattan Project before Truman did). Thus he took the decision to use them in a bit of an information vacuum, something historians have subsequently either downplayed or over-emphasized. He also desegregated the US military in 1948, because of his disgust over the way African-American war veterans were treated; the fact that it also saved some tax dollars getting rid of that ridiculous redundancy helped sell it too.- Harry S. Truman (Wikipedia)
Harry S. Truman (May 8, 1884 – December 26, 1972) was the 33rd president of the United States, serving from 1945 to 1953. A member of the Democratic Party, he previously served as a United States senator from Missouri from 1935 to 1945 and briefly as the 34th vice president in 1945 under Franklin D. Roosevelt. Assuming the presidency after Roosevelt’s death, Truman implemented the Marshall Plan in the wake of World War II to rebuild the economy of Western Europe and established both the Truman Doctrine and NATO to contain the expansion of Soviet communism. He proposed numerous liberal domestic reforms, but few were enacted by the conservative coalition that dominated the Congress.