Not dropping it!
Harry s. truman approved the dropping of an atomic bomb on japan.
Most think he was not wrong about dropping the atomic bombs.
The atomic bomb was dropped on Hiroshima and Nagasaki in World War 2.
It ended the war!
President Truman.
President Truman
President Truman.
See atomic bombings of Hiroshima and Nagasaki
If you mean what happened to them at the end of WW2 then they were invaded by America (USA) and the USA dropped an atomic bomb on them as a symbol of strength to scare the Japanese and force them to surrender in which they succeeded. The US occupied Japan after dropping the atomic bomb, but it never invaded Japan. The reason for dropping the A-Bomb was to prevent the need to invade.
it would prevent high casualties that would be caused by an invasion of mainland Japan.
It ended WWII & the world entered the "Atomic Age."