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Warren G. Harding was inaugurated as the 29th president of the United States on March 4, 1921.
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Charles Lindbergh became the first man and person to fly across the Atlantic Ocean nonstop in his plane called The Spirit of Saint Louis.
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The Star-Spangled Banner was adopted as the national anthem on March 3, 1931.
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Hattie Wyatt Caraway of Arkansas became the first woman to be elected as a United States Senator on January 12, 1932.
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Amelia Earhart became the first woman to fly a plane across the Atlantic Ocean on May 21, 1932.
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The Twentieth Amendment, the Lame Duck Amendment, of the Constitution was ratified on January 23, 1933. The amendment moved Inauguration Day from March 4th to January 20th.
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The Twenty-First Amendment was ratified on December 5, 1933. The amendment ended the Prohibition from the Eighteenth Amendment.
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President Franklin D. Roosevelt became the first and only president to be inaugurated three times on January 20, 1941.
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On December 11, 1941, America declares war on Germany and Italy due to Germany and Italy declaring war on America three days before, and when America declared war on the two countries, America officially entered World War II.