Franklin D. Roosevelt was the president at the beginning of and throughout the majority of WWII. Harry S. Truman was Roosevelt's vice-president. Truman succeeded him as the 33rd president upon Roosevelt's death on April 12, 1945. It was Truman's decision to use atomic weaponry on Hiroshima and Nagasaki that lead to the end of WWII.
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US PresidentHarry Truman was US President at the end of World War 2.
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Harry S Truman was US president at the end of World War 2 in 1945.Harry Truman
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Franklin Roosevelt was the US President when WW 2 started.
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Harry S. Truman .