On August 6, 1945, the United States dropped the first atomic bomb on the Japanese city of Hiroshima during World War II. The bomb, known as Little Boy, instantly killed an estimated 70,000 people, with tens of thousands more dying later from radiation sickness. The attack remains the only use of nuclear weapons in war. It led to Japans eventual surrender, but the long-term effects of the bombing, including radiation-related illnesses, affected survivors for decades. The bombing of Hiroshima has been a focal point in discussions on nuclear warfare and international peace.