dropped a uranium gun-type atomic bomb (Little Boy) on Hiroshima. At the Potsdam Conference, the Allies called for the unconditional surrender of the Japanese armed forces, with the alternative being “prompt and utter destruction.” The Japanese ignored this ultimatum, prompting the American government to plan a nuclear attack.In the final year of the war, the Allies prepared for what was anticipated to be a very costly invasion of the Japanese mainland, with estimates of half a million casualties on both sides.
