After America had dropped two atomic bombs on Hiroshima and Nagasaki, Japan surrendered to America during WWII.
There was only one and it was an atomic one which destroyed the city.
See: Twentieth Air Force
Unfortunately, most of them died on impact of the atomic bomb. Some were also killed by the blast of the bomb, and after a few weeks, some people started to get "radiation" disease and died.
Between February 13th and February 14th 1945, between 35,000 and 135,000 people and 3,300 tons of bombs were dropped on the city, that's all ino