While no act of war is necessary, it could be argued that dropping the bomb did end the war immediately; otherwise it could have been some time before an end was reached and more lives may have been lost.
The US President Harry Truman.
The reason was to end the war with Japan .
President Truman got the order to use them against Japan.
truman
Harry S. Truman decided to drop the atomic bomb on Japan during World War II.
End the war with japan and to scare the Soviets.
The reason was to end the war with Japan .
Force them to surrender as soon as possible.
To end the war with Japan .
Harry Truman drop the Atomic Bomb on Hiroshima, Japan and Nagasaki, Japan.
Truman
Japan did not agree to surrender unconditionally and Truman then consulted with his advisers and decided to use the new weapon on Hiroshima and Nagasaki.