January 13 - The Humanist Society is established in Hollywood, California to humanize religion, disseminate science, stimulate thought and promote good will.
January 29 - The Seeing Eye Guide Dog Foundation is organized.
February 13 - Six gangsters are machine gunned to death in the St. Valentine's Day Massacre.
February 13 - Congress passes the Cruiser Act, authorizing construction of 19 new cruisers and 1 aircraft carrier.
May 16 - The first motion picture Oscars are awarded.
July 1 - The Immigration Act of 1924 goes into effect, instituting a quota system for immigrants into the U.S.
July 10 - Current size of paper money in the U.S. is made official.
August 19 - The first dirigible made completely of metal is constructed in Grosse Ile, Michigan.
August 30 - Colonel E. H. Green takes delivery of a new combination gas and electric automobile, built by the General Electric Company.
October 8 - The first movie to be shown on an aircraft is a newsreel shown on Transcontinental Air Transport.
October 21 - The first air ambulance is organized in New York City.
October 28 - The first child is born in an airplane over Miami, Florida.
October 29 - The New York Stock Exchange collapses in New York City -- Black Tuesday -- setting off the Great Depression.
November 29 - Commander Richard Byrd makes his first flight over the South Pole.
December 5 - The first nudist organization in the U.S., the American League for Physical Culture, opens in New York City.
