Atomic Bomb On August 6, 1945, the world changed forever. On that day the United States of America detonated an atomic bomb over the city of Hiroshima. Never before had mankind seen anything like it. Here was something that was much bigger than an ordinary bomb, yet could cause infinitely more destruction. It could rip through walls and tear down houses like the devils wrecking ball. In Hiroshima, it killed 100,000 people, most non-military civilians. The immediate effects of this bombing were simple. The Japanese government surrendered, unconditionally, to the United States. The rest of the world rejoiced as the most destructive