After Roosevelt passed, this president made the heavy decision to drop the A-bomb.

Then-Vice President Harry S. Truman was ushered into the driver's seat when FDR passed away, leaving him in the grips of WWII. Previously unaware of the Manhattan Project, Truman was handed the difficult decision to drop the A-bomb, which he ultimately did. That wasn't the only tough war-time decision he made as president; he also sent forces to prevent the expansion of communism in Korea. Let the Cold War begin.

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