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At the University of Chicago, the first nuclear chain reaction is produced in the Manhattan Project, creating a fission of the Uranium U-235.
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Allied soldiers stormed the beaches of France to begin the World War II invasion of Europe. Operation Overlord gained footing quickly, and pushed through the Atlantic Wall.
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Franklin D. Roosevelt sworn-in as United States President in January 20, 1945.
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The surrender of Germany at Reims, France end the military engagements of World War II in Europe.
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President Harry S. Truman gives the go-ahead for the use of the atomic bomb on the Japanese city of Hiroshima and three days later on Nagasaki.
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In response to the detonation of the Soviet Union's first atomic bomb, President Harry S. Truman orders the development of the hydrogen bomb.
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The Twenty-second Amendment to the United States Constitution is ratified which limits the President to two terms.
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The Marshall Plan expires after distributing more than $13.3 billion USD in foreign aid for European nations.
