Harry Truman did not know of the existence of the Manhattan Project at the time that he became president.

Name: Harry Truman did not know of the existence of the Manhattan Project at the time that he became president.
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Harry Truman was not informed about the Manhattan Project, which was the code name for the American-led effort to develop atomic bombs, until after he became President following Franklin D. Roosevelt's death in April 1945.

Harry Truman Did Not Know of the Existence of the Manhattan