U.S. President Harry S. learns of the Manhattan Project after the death of President Roosevelt in April of 1945, when he relinquished his role as Vice President and took the oath of office as the next president of the United States.
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