Three days later, a second atomic bomb was dropped on the city of Nagasaki, causing the deaths of approximately 40,000. On 6 August 1945, during the final stages of the Second World War, the United States (with the consent of the United Kingdom as laid out in the Quebec Agreement) dropped the world’s first deployed atomic bomb over the Japanese city of Hiroshima, instantly killing over 80,000 people and wounding, disfiguring and poisoning tens of thousands more.