The Bombing of Hiroshima and Nagasaki

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The bombing took place on August 6, 1945. An American B-29 bomber dropped the world’s first deployed atomic bomb over the Japanese city of Hiroshima. The effects killed 90,000–166,000 people in Hiroshima. 

The Hiroshima prefectural health department estimates that, of the people who died on the day of the explosion, 60% died from flash or flame burns, 30% from falling debris and 10% from other causes. During the following months, large numbers died from the effect of burns, radiation sickness, and other injuries, compounded by illness. In a US estimate of the total immediate and short term cause of death, 15–20% died from radiation sickness, 20–30% from flash burns, and 50–60% from other injuries, compoundedby illness.

Three days after Hiroshima was bombed, a second A-bomb was dropped on Nagasaki. This killing 60,000–80,000 people.

The U.S. decided to use an atomic bomb to end the war as quickly and efficiently as possible.

Japan's Emperor Hirohito announced his country's unconditional surrender in World War II in a radio address on August 15, citing the devastating power of "a new and most cruel bomb."

If the U.S. had not dropped said bombs, then Japan would not have surrendered and America and its allies would not have won World War II.