The bombing of Hiroshima and Nagasaki was when for the first time ever the U.S. had invented an atomic bomb. The U.S. had sent an atomic bomb onto Hiroshima on August 6, 1945. The survivors of Hiroshima went to Nagasaki to seek aid. Later the U.S. sent an atomic bomb onto Nagasaki on August 9, 1945. Everybody had different sides on whether or not it should have been used. The people that said it was unnecessary gave the reason that the Japanese was gonna surrender if they could keep their Emperor however the Japanese didn't know if the U.S. would agree. But still the Soviet Union was expected to declare war onto Japan and the Japanese was expected to surrender. The bombings wasn't the main reason that Japan would surrender. It was because the Soviet Union declared war on them shortly before they surrendered on August 15, 1943.