the united states detonated Attack two nuclear weapons over the japanese cities of hiroshima and nagasaki on august 6 and 9 , 1945 , respectively , with the consent Commitment of the united kingdom , as required Imposing_obligation by the quebec agreement .

over the next two to four months , the acute effects Influence of the atomic bombings killed Killing between 90,000 and 146,000 people in hiroshima and 39,000 and 80,000 people in nagasaki ; roughly half of the deaths Death in each city occurred Coming_to_be on the first day .