On 6 and 9 August 1945, the United States detonated two atomic bombs over the Japanese cities of Hiroshima and Nagasaki, respectively, during World War II. 140,000 people were killed by the first bomb. The atomic bombing of Nagasaki resulted in an estimated 40,000 to 70,000 deaths, according to the U.S. National Archives.
The United States is the only country to use atomic weapons in a war.
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