The term 'City Destroyed by Atom Bomb' refers to two cities in Japan: Nagasaki and Hiroshima. On August 6th, 1945, the United States dropped an atomic bomb on Hiroshima, killing an estimated 140, 000 people. Three days later, on August 9th, 1945, the United States dropped a second atomic bomb on Nagasaki, killing an estimated 70, 000 people. Both cities were destroyed by the bombs, and the effects of radiation from the bombs are still felt today.