- Feb 11 Vatican City (world's smallest country) made an enclave of Rome
- Feb 14 St Valentine's Day Massacre in Chicago, 7 gangsters killed, allegedly on Al Capone's orders
- May 16 1st Academy Awards: "Wings", Emil Jannings & Janet Gaynor win
- Jun 3 Chile and Peru sign the Treaty of Lima, finally resolving their border dispute from the War of the Pacific (1879–83). Chile keeps Arica and Peru regains Tacna.
- Jun 7 Vatican City becomes a sovereign state
- Jun 25 US President Herbert Hoover authorizes building of Boulder Dam (Hoover Dam)
- Jun 27 1st color TV demo, performed by Bell Laboratories in NYC
- Aug 11 Babe Ruth becomes 1st professional baseball player to hit 500 homers (off Willis Hudlin of Cleveland Indians)
- Oct 24 "Black Thursday", start of stock market crash, Dow Jones down 12.8%
- Oct 29 "Black Tuesday" Wall Street Stock Market crashes triggering the "Great Depression"
NY Yankees become 1st team to wear uniform numbers
On April 16, 1929
Women are considered "Persons" under Canadian law
On October 18, 1929