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Franklin D. Roosevelt became the first and only president to be inaugurated four times on January 20, 1945, and he succeeded by his vice president, Harry Truman.
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On August 6, 1945, the United States dropped an atomic bomb on Hiroshima, Japan.
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On August 9, 1945, the United States dropped an atomic bomb on Nagasaki, Japan after previously dropping another atomic bomb on Hiroshima, Japan three days earlier.
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The United States territory called the Philippines became an independent country on July 4, 1946.
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On June 27, 1950, America joins the Korean War. President Truman sends troops to the Korean War without approval from Congress.
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On February 27, 1951, the Twenty-Second Amendment of the Constitution was ratified. This limited president to only two terms.
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Puerto Rico became a United States commonwealth on July 25, 1952.
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Dwight Eisenhower was inaugurated as the 34th president of the United States of America on January 20, 1953.