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For the first time, the 1920 census indicates a population in the United States over 100 million people. The 15% increase since the last census now showed a count of 106,021,537. The geographic center of the United States population still remained in Indiana.
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The League of Nations is established with the ratification of the Treaty of Versailles, ending the hostilities of the first World War. Nine days later the United States Senate votes against joining the League.
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A national quota system on the amount of incoming immigrants is established by the United States Congress in the Emergency Quota Act, curbing legal immigration.
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Construction begins on Yankee Stadium in New York City, often dubbed the House that Ruth Built.
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Time Magazine is published for the first time.
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Warner Brothers Pictures is incorporated.
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The first flight to the North Pole and back occurs when pilot Floyd Bennett, with Richard Evelyn Byrd as his navigator, guided a three-engine monoplane. They were awarded the Medal of Honor for their achievement.
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The civil war in China prompts one thousand United States marines to land in order to protect property of United States interests.
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Work on the gigantic sculpture at Mount Rushmore begins. Sculptor Gutzon Borglum would complete the task of chiseling the busts of four presidents; George Washington, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt, fourteen years later.
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The United States Congress approves the construction of Boulder, later named Hoover Dam.
