What caused japanese to surrender during world war 2?
Not to be too broad, but I would have to say it was the two MASSIVE atomic bombs we dropped on top of them! These were the first, and only, atomic bombs ever dropped in a war and devastated two important cities in Japan. They had no way of retaliating to that kind of firepower and decided to throw in the towel. The two bombs were: 1. “Little Boy” dropped over Hiroshima on Monday, August 6, 1945 2. “Fat Man” dropped on Nagasaki on Thursday, August 9, 1945 Within the first two to four months of the bombings, the acute effects killed 90,000–166,000 people in Hiroshima and 60,000–80,000 in Nagasaki, with roughly half of the deaths in each city occurring on the first day. Six days after the detonation over Nagasaki, on August 15, Japan announced its surrender to the Allied Powers, signing the Instrument of Surrender on September 2, officially ending the Pacific War and therefore World War II.