Finland 1/10/1920 League of Nations Formed The League of Nations was formalised after the Covenant of the League of Nations was ratified by 42 nations in 1919. The United States did not join.
United States 1/19/1920 ACLU Founded The American Civil Liberties Union was founded.
United States 2/14/1920 League of Women Voters The League of Women Voters was founded in Chicago.
United States 5/2/1920 Negro National League The Negro National League played their first baseball game in Indianapolis, Indiana.
United States 6/13/1920 Children Cannot be Mailed The US Post Office Department rules that children cannot not be sent via parcel post.
United States 8/26/1920 19th Amendment Ratified The Nineteenth Amendment to the US Constitution was passed, guaranteeing suffrage for women.
United States 9/17/1920 National Football League Established The National Football League was established. Its name at the time was the American Professional Football Association.