American scientists created the atomic bomb as a way to end World War II with a minimum amount of bloodshed. Though it caused approximately 130,000 deaths when it was dropped on Hiroshima, it is estimated that it saved over half a million lives by being the means by which the war was ended.tom Bomb Invention  Short answer: Leo Szilard invented the Atomic Bomb in 1933  and patented it in 1934.