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Surprise aerial attack on the U.S. naval base at Pearl Harbor on Oahu Island, Hawaii, by the Japanese.
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United States Congress declared war on the Empire of Japan in response to that country's surprise attack on Pearl Harbor the prior day.
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Between 4 and 7 June 1942, the United States decisively defeated an attacking fleet of the Imperial Japanese Navy
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the American bomber Enola Gay dropped a five-ton bomb over the Japanese city of Hiroshima.
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Three days after the bombing of Hiroshima, the United States dropped a second atomic bomb on the city of Nagasaki.
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Japan was forced to surrender due to the bombings on Hiroshima and Nagasaki.
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The United Nations (UN) is an intergovernmental organization to promote international co-operation and wast established after World War II in order to prevent another such conflict.