Who was 33rd President of the United States, taking over after the death of Franklin Roosevelt, and was responsible for giving the orders to drop the atomic bomb on Hiroshima in 1945?

Who was 33rd President of the United States, taking over after the death of Franklin Roosevelt, and was responsible for giving the orders to drop the atomic bomb on Hiroshima in 1945?

Theodore (Teddy) Roosevelt

Winston Churchill

Joseph Stalin

Harry S. Truman

Harry S. Truman