The atomic bomb was developed during the time president Franklin D. Roosevelt was in power. The bomb was to be developed and used during WW2 on Japan. The bomb was dropped on Nagasaki and Hiroshima. There were to be more atomic bombs dropped but it was set off. This bomb can wipe out an entire city and leave radiation to kill off what was left behind. The bomb was so powerful it caused Japan to surrender. It left many dead and the ones who survived wished they had died from the diabolical effects.