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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, eight miles south-southeast of Spencer, in Owen County.
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Women are given the right to vote when the 19th Amendment to the United States constitution grants universal women's suffrage. Also known as the Susan B. Anthony amendment, in recognition of her important campaign to win the right to vote.
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A landslide victory for Warren G. Harding in both the Electoral College and popular vote returns the Republican Party to the White House. Harding gained over 16 million popular votes to Democratic candidate James M. Cox's 9 million and won the Electoral contest with a 404 to 127 landslide. This was the first election in which women had the right to vote.
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A Congressional resolution by both houses is signed by President Warren G. Harding, declaring peace in World War I hostilities with Germany, Austria, and Hungary. The treaties would be executed one month later.
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Construction begins on Yankee Stadium in New York City, often dubbed the House that Ruth Built.
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The first sound on film motion picture Phonofilm is shown in the Rivoli Theatre in New York City by Lee de Forest.
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President Warren G. Harding dies in office after becoming ill following a trip to Alaska, and is succeeded by his Vice President, Calvin Coolidge. Coolidge would oppose the League of Nations, but approved of the World Court.
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All Indians are designated citizens by legislation passed in the U.S. Congress and signed by President Calvin Coolidge. The Indian Citizenship Act granted this right to all Native Americans that had been born within the territory of the United States.
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Nellie Tayloe Ross is inaugurated as the first woman governor of the United States in Wyoming. Miriam Ferguson is installed two weeks later as the second during a ceremony in Texas.
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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 the property of United States interests.
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Amelia Earhart becomes the first woman to fly over the Atlantic Ocean.
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Herbert Hoover wins election as President of the United States with an Electoral College victory, 444 to 87 over Democratic candidate Alfred E. Smith, the Catholic governor of New York.
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Future Civil Rights leader Martin Luther King is born in his grandfather's house in Atlanta, Georgia.
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Postwar prosperity ends in the 1929 Stock Market crash. The plummeting stock prices led to losses between 1929 and 1931 of an estimated $50 billion and started the worst American depression in the nation's history.