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U.S. President Harry S. learns of the Manhattan Project on April 25, 1945, after the death of President Roosevelt in April and he took the oath of office as the next president of the United States.
He was briefed by Henry Stimson, Secretary of War. While a Senator, Truman had noticed large, secret government expenditures in Washington state in 1943, but Secretary Stimson had personally asked him to stop investigating for national security reasons.
Truman went on to became in charge of the most difficult moral and tactical decision of World War II: whether or not to drop the atomic bomb. His ultimate decision led to the bombings of Hiroshima and Nagasaki. More
