The American Civil Liberties Union was founded on January 20.
On January 29, Walt Disney begins working as an animator for KC Slide Company for $40 a week.
Source: https://www.rd.com/culture/why-there-are-no-moms-in-disney-movies/
On Febuary 13, the National Negro Baseball League is organized.
February 14: The League of Women Voters forms in Chicago.
Source: https://www.lwvabcwi.org/history
Babe Ruth hits his first home run for the Yankees on May 1.
On May 2, the first game of the National Negro Baseball League is played in Indianapolis.
Source: https://www.history.com/topics/sports/negro-league-baseball
Woodrow Wilson makes the Communist Labor Party illegal.
Source: https://en.wikipedia.org/wiki/Communist_Labor_Party_of_America
May 16: Joan of Arc is canonized as a saint.
Source: https://www.history.com/topics/middle-ages/saint-joan-of-arc
June 13: The United States Post Office announces that parents cannot send their children in the mail after a number of instances of them doing so.
On August 18, after receiving a letter from his mother telling him to "be a good boy" and ratify the 19th amendment, 22-year old Tennessee Representative Harry T. Burn becomes the deciding vote in the ratification of the 19th amendment giving women the right to vote.
Source: https://constitutioncenter.org/blog/the-man-and-his-mom-who-gave-women-the-vote/
August 20: The American Professional Football Association forms, becoming the NFL a few years later.
Source: http://www.apflfootball.com/
Ethelda Bleibtrey becomes the first woman to win the Olympics on August 25.
On September 16, a horse-drawn wagon explodes on Wall Street, killing 38 and injuring 143 people.
Source: https://en.wikipedia.org/wiki/Wall_Street_bombing#/media/File:Wallstreetbmb.jpg
Republican Warren G. Harding wins the presidential election, beating Democrat James M. Cox on November 2.
Source: https://www.pbs.org/wgbh/americanexperience/features/presidents-harding/
November 11: Mussolini's squad begins terror, killing 11 in Bologna, Italy.
Source: https://allthatsinteresting.com/benito-mussolini-death
On November 27, the first American superhero movie, The Mask of Zorro, starring Douglas Fairbanks, is shown in New York City