Throughout most of WW2 , Franklin D. Roosevelt was the president. However, he died in the final year before WW2 ended, and Truman became president. Truman is the one who issued the atomic bombs order on Japan, which eventually ended the war.
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Franklin Delano Roosevelt was president until his death in April 1945. The next president was Harry S. Truman (1945–53).
Roosevelt
It was president Franklin D. Roosevelt who order the development of the atomic bomb. It was Harry S. Truman who order its use on Japan during World War II.
World War II
Eisenhower was a general in World War II and was selected to lead the D-day invasion.
FDR : Franklin Delano Roosevelt .