Who was responsible for the Hiroshima and Nagasaki bombings?
Setting a precedent that continues today, the order for the bombings was given by President Harry Truman. Except in very specific situations, only the President can authorize the use of nuclear weapons.
Historians cite the failure of Japan to surrender despite devastating firebombings of Japanese cities and the decimation of their naval forces. Had they admitted defeat, atomic bombs might not have been necessary, and the world's history might have been very different.