- January 15
- Irish Free State forms; Michael Collins becomes first premier. [1]
- January 18
- Irish author Liam O'Flaherty and others occupy the Rotunda in Dublin. [1]
- January 19
- US Geological survey says US oil supply would be depleted in 20 years. [1]
- January 29
- Union of Costa Rica, Guatemala, Honduras, and El Salvador is dissolved. [1]
- January 30
- World Law Day is first celebrated. [1]
- February 2
- James Joyce's book Ulysses is published in Paris, France (1,000 copies). [1]
- February 5
- Reader's Digest magazine is first published. [1]
- February 6
- Cardinal Achille Ratti is elected Pope Pius XI. [1]
- A treaty limiting naval armament is signed by the United States, Great Britain, France, Italy, and Japan. The limits set for total tonnage of major naval ships are: USA 525,000, Great Britain 525,000, France 175,000, Italy 175,000, Japan 315,000. [10]
- February 8
- President Warren G. Harding introduces the first radio in the White House. [1] [5]
- February 9
- Italian government of Bonomi falls. [1]
- February 11
- US intervention army leaves Honduras. [1]
- February 15
- Marconi begins regular broadcasting transmissions from Essex, England. [1]
- February 20
- Vilnius, Lithuania, agrees to separate from Poland. [1]
- February 21
- Airship Rome explodes at Hampton Roads, Virginia, USA; 34 die. [1]
- Great Britain grants Egypt independence. [1]
- February 23
- Henri Landru is executed in France for having 11 wives. [1]
- February 28
- Egypt regains independence from Britain, but British troops remain. [1]
- English princess Mary marries viscount Lascelles. [1]
- March 1
- Albania joins the Universal Postal Union. [995.36]
- March 3
- Italian fascists occupy Fiume and Rijeka. [1]
- March 10
- State of siege proclaimed during mine strike in Johannesburg, South Africa. [1]
- March 16
- Sultan Fuad I is crowned king of Egypt; England recognizes Egypt. [1]
- March 18
- British magistrates in India sentence Mohandas K Gandhi to six years in prison for disobedience. [1]
- March 20
- The USS Langley is commissioned as the first United States Navy aircraft carrier. [1] [5]
- March 28
- First microfilm device is introduced. [1]
- April 3
- Josef Stalin is appointed General Secretary of Communist Party. [1]
- April 14
- Republic rebels occupy four government courts in Dublin, Ireland. [1]
- April 16
- Annie Oakley sets record by breaking 100 clay targets in a row. [1]
- German-Russian treaty signed in Italy; Soviet Union recognized. [1]
- April 22
- South Ossetian Autonomous Region is established in Georgian SSR. [1]
- April 24
- In Barnegat, New Jersey, USA an overhead explosion of comet fragment rocks buildings, shatters windows, and releases clouds of noxious gas. [521]
- April 27
- Yakut ASSR formed in Russian SFSR. [1]
- May 16
- White Star Line Majestic ocean liner completes 5.5-day maiden voyage. [1]
- May 18
- Dutch second Chamber agrees to 48-hour work week (was 45 hours). [1]
- May 20
- Egypt sinks off Ushant after colliding with Seine, killing 90. [1]
- May 21
- On the Road to Moscow is first cartoon to receive a Pulitzer Prize. [1]
- Pulitzer prize awarded to Eugene O'Neill (Anna Christie). [1]
- May 23
- Walt Disney incorporates Laugh-O-gram Films, using the remaining assets of Iwwerks-Disney Commercial Artists, and US$15,000 from local investors. (About nine films are produced, but with virtually no revenue, the venture ends in bankruptcy in about a year.) [1] [6]
- May 24
- Russian-Italian trade agreement signed. [1]
- May 29
- Ecuador becomes independent. [1]
- May 30
- Latvia and Vatican sign accord. [1]
- In Washington, D.C., the Lincoln Memorial is dedicated. [1] [5] [415.52] [512.44]
- June 22
- Field Marshal Sir Henry H Wilson is murdered in London, England. [1]
- June 24
- Dr Walter Rathenau, German foreign minister, is killed by anti-semites. [1]
- June 27
- The American Library Association awards the first Newberry Medal, honoring the year's best children's book, to The Story of Mankind by Hendrik Willem van Loon. [1] [129]
- July 20
- Togo is made a mandate of the League of Nations. [1]
- July 31
- 18-year-old Ralph Samuelson rides world's first water skis (Minnesota, USA). [1]
- August 4
- 13 million telephones in the U.S. and Canada go dead as the Bell System shuts down all its switchboards and switching stations at 6:25PM for one minute, in memory of Alexander Graham Bell. [457]
- August 22
- Michael Collins, Sinn Fein leader, is killed by rebels. [1]
- August 28
- WEAF in New York City airs first radio commercial (Queensboro Realty - $100 for 10 minutes). [1]
- September 11
- British mandate of Palestine begins. [1]
- September 13
- 136.4 degrees F (58 degrees C), El Aziziyah, Libya in shade (world record). [1]
- September 17
- Radio Moscow begins transmitting (12 kilowatts - most powerful station). [1]
- September 21
- US President Warren G Harding signs a joint resolution of approval to establish a Jewish homeland in Palestine. [1]
- September 28
- Benito Mussolini marches on Rome, Italy. [1]
- October 3
- First facsimile photo sent over city telephone lines, Washington, DC. [1]
- October 14
- First automated telephones - Pennsylvania exchange in New York City. [1]
- October 18
- British Broadcasting Corporation (BBC) is established. [1] [457]
- October 28
- Benito Mussolini takes control of Italy's government. [1]
- October 30
- Benito Mussolini forms cabinet in Italy. [1]
- October 31
- Benito Mussolini (Il Duce) becomes premier of Italy. [1]
- November 1
- The Ottoman Empire is abolished. [1]
- November 4
- In Egypt's Valley of the Kings, Howard Carter and workers uncover a stone stairway leading to an ancient tomb, with seals intact. (The tomb is later determined to be that of King Tutankhamen.) [1] [66.25]
- November 14
- The British Broadcasting Corporation (BBC) begins radio service from Marconi House in the United Kingdom. [1] [5] [457]
- November 26
- At a burial tomb (of King Tutankhamen) in Egypt's Valley of the Kings, Howard Carter views inside a second doorway into the burial chamber, seeing "everywhere the glint of gold". [66.27] [129]
- November 28
- Captain Cyril Turner (Royal Air Force) gives first skywriting exhibition (New York City). Turner spells out "Hello USA. Call Vanderbilt 7200." 47,000 called. [1]
- November 30
- The Japanese navy's Honsho aircraft carrier is launched for sea trials. This is the world's first designed and completed aircraft carrier. The ship can carry 21 aircraft, and can travel at a speed of 25 knots. [55.13]
- December 1
- Polish state chief marshal Jozef Pilsudski resigns. [1]
- December 3
- First successful Technicolor movie (Tale of the Sea), shown in New York City, New York. [1]
- December 6
- First constitution of Irish Free State comes into operation. [1]
- A rain of stony meteorites occurs in Tsarev, Russia, dispersed over 65km2, estimated 1300kg site, 80 recovered meteorites, ranging 50 grams to 284kg. [526.156]
- December 9
- Gabriel Narutowicz is elected Polish President. [1]
- December 10
- Nobel Prizes awarded to Fridtjof Nansen, Niels Bohr, and Albert Einstein. [1]
- December 15
- IVVV association peace congress on war forms in the Hague, Netherlands. [1]
- December 16
- Gabriel Narutowicz, first President of Poland (December 7-16, 1922), is assassinated. [1]
- December 17
- Last British troops leave Ireland Freestate. [1]
- December 20
- Fourteen republics form Union of Soviet Socialistic Republics (USSR). [1]
- Polish parliament selects Stanislaw Wojcieckowski as president. [1]
- December 22
- Belgian parliament rejects Dutch University in Ghent. [1]
- In Egypt, the first official press viewing of Tutankhamen's tomb takes place. [66.28]
- December 23
- BBC Radio begins daily newscasts. [1]
- Pope Pius XI pleas for peace: encyclical Ubi arcano. [1]
- December 24
- BBC sends first British radio play Truth about Father Christmas. [1]
- December 25
- Vladimir Lenin dictates his "Political testament". [1]
- December 29
- Revised Netherlands Law proclaims suffrage. [1]
- December 30
- The Union of Soviet Socialist Republics (USSR) is established, comprising a confederation of Russia, Belorussia, Ukraine, and the Transcaucasian Federation. [1] [129]
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