- January 11
- First Dutch Dada-evening (Theo Van Doesburg and Kurt Schwitters). [1]
- French and Belgian troops occupy Ruhr to collect reparations. In protest, Berlin ceases payment of all reparations. [1] [37]
- January 17
- Belgian Working People Party protests against occupied Ruhrgebied. [1]
- January 18
- First radio telegraph message from Netherlands to Dutch East Indies. [1]
- January 24
- Aztec Ruins National Monument, in New Mexico, USA, is established. [1]
- January 25
- NVV donates 100,000 gulden to mine workers of Ruhrgebied. [1]
- January 28
- Demonstration against a Dutch University in Ghent. [1]
- NSDAP first election in Munich, Germany. [1]
- February 1
- Allied ultimatum on Lithuanian occupation of Memel. [1]
- Fascists Voluntary Militia forms in Italy under Benito Mussolini. [1]
- February 2
- US signs friendship treaty with Central American countries. [1]
- February 5
- General mine strike against wage cuts in Saar. [1]
- Mass arrests of socialists and communists in Italy. [1]
- February 8
- Coal mine explosion at Dawson, New Mexico, USA kills 120. [1]
- February 9
- Soviet Aeroflot airlines is established. [1]
- February 10
- SDAP speaks out against allied occupation of Ruhrgebied. [1]
- February 16
- Allies accept Latvia's occupation of Memel territory. [1]
- In Thebes, Egypt, English archaeologist Howard Carter enters the sealed burial chamber of the ancient Egyptian ruler King Tutankhamen. [1] [129]
- February 18
- Borinage-mine workers in Belgium go on strike for higher wages. [1]
- February 23
- German Republic day with laws against worker. [1]
- Great Britain lowers import duty on German products from 26 percent to 5 percent. [1]
- February 24
- Mass arrests in US of Mafia. [1]
- February 25
- Bread in Berlin, Germany rises to 2,000 marks. [1]
- February 26
- Italian nationalists and fascists merge (blue-shirts and black-shirts). [1]
- March 1
- Allies occupy Ruhrgebied, killing railroad striker. [1]
- March 3
- Time magazine publishes first issue. [1]
- US Senate rejects membership in International Court of Justice, The Hague. [1]
- March 4
- Vladimir Lenin's last article in Pravda (about Red bureaucracy). [1]
- March 13
- Lee de Forest demonstrates his sound-on-film moving pictures (New York City, New York). [1]
- March 14
- Allies accepts Vilnus taking East-Galicië in Poland. [1]
- German Supreme Court prohibits NSDAP political party. [1]
- March 20
- Bavarian Minister of Interior refuses to forbid National Socialist SA. [1]
- Belgian Senate rejects Dutch University in Ghent. [1]
- March 21
- US foreign minister Charles Hughes refuses USSR recognition. [1]
- March 25
- British government grants Trans-Jordan autonomy. [1]
- March 31
- French soldiers fire on workers at Krupp factory in Essen; 13 die. [1]
- April 1
- First sound short films shown in New York's Rivoli Theatre. [242.4]
- San Marino elects two fascist regent-captains, beginning the rule of the Fascist Party. [501.154]
- April 5
- Firestone Company puts their inflatable tires into production. [1]
- April 7
- First brain tumor operation under local anesthetic performed (Beth Israel Hospital in New York City) by Dr K Winfield Ney. [1]
- April 10
- Adolf Hitler demands "hatred and more hatred" in Berlin, Germany. [1]
- April 15
- Insulin first becomes generally available for use by diabetics. [5]
- First sound on film public performance shown at Rialto Theater (New York City). [1]
- April 18
- Poland annexes Central Lithuania. [1]
- April 19
- New Egyptian law allows suffrage for men, except soldiers. [1]
- April 24
- Colonel Jacob Schick patents Schick shavers. [1]
- April 26
- English prince Albert (George VI) marries lady Elizabeth Bowes-Lyon. [1]
- May 3
- First nonstop transcontinental flight (New York-San Diego) completed. [1]
- May 4
- Bloody street battles between National Socialists, socialists, and police in Vienna, Austria. [1]
- May 7
- Mine strike at Belgian Borinage railroad. [1]
- May 10
- Vaslav Vorovsky, Russian delegate, is assassinated. [1]
- May 13
- Pulitzer prize awarded to Willa Carter (One of Ours). [1]
- May 19
- KPD (communist revolts) in German Ruhr cities occupied by Allies. [1]
- May 22
- Stanley Baldwin succeeds Andrew Bonar Law as British premier. [1]
- May 23
- Belgium's SABENA airline launches. [1] [5]
- May 25
- Britain recognizes Transjordan with Abdullah as its leader. [1]
- May 26
- Socialist Workers Youth International forms in Hamburg, Germany. [1]
- May 31
- China and USSR exchange diplomats. [1]
- June 27
- Captain Lowell H. Smith and Lieutenant John P. Richter perform the first ever aerial refueling in a DH-4B biplane. [5]
- June 29
- General JC Gomez, Venezuela's first Vice President, is assassinated. [1]
- June 30
- New Zealand claims Ross Dependency in Antarctica. [1]
- July 6
- Union of Soviet Socialist Republics forms. [1]
- July 10
- 2-pound hailstones kill 23 and many cattle (Rostov, Russia). [1]
- All non-fascist parties disolved in Italy. [1]
- July 13
- The Hollywood Sign (reading "Hollywoodland") is officially dedicated in Los Angeles, California. [5]
- July 20
- Francisco Pancho Villa is killed in an ambush in Parral, Chihuahua, Mexico. [450.86]
- July 24
- Allied Powers and Turkey sign peace treaty, Lausanne. [1]
- August 13
- Mustapha Kemal elected president of Turkey. [1]
- September 1
- Earthquake strikes Tokyo and Yokohama, Japan; kills 106,000. [1]
- September 4
- The first U.S. airship, the USS Shenandoah, makes its maiden flight. [5]
- September 11
- The ZR-1 (biggest active dirigible) flies over New York's tallest skyscraper, the Woolworth Tower. [1]
- September 12
- Britain takes over Southern Rhodesia from British South Africa Co. [1]
- September 14
- Miguel Primo de Rivera becomes dictator of Spain. [1]
- October 11
- German mark falls to 10 billion per pound, 4 billion per dollar. [1]
- October 16
- John Harwood patents the self-winding watch. [5]
- Walt and Roy Disney, as the Disney Brothers Cartoon Studio, sign a contract with M.J. Winkler Productions, a New York film distributor, to produce six Alice Comedy short films, for US$1500 each, with an option for six more. (This date is considered the beginning of the Disney studio.) [6]
- October 21
- Deutsches Museum, München, first Walther Bauersfeld Zeiss Planetarium. [1]
- October 29
- The republic of Turkey is declared, with Mustafa Kemal Ataturk as first president. [1] [391.28]
- November 3
- Swedish Crown Prince Gustav Adolf marries Lady Louise Mountbatten in the Chapel Royal at St. James' Palace in England, hosted by King George V. [7]
- November 6
- USSR adopts experimental calendar, with 5-day "weeks". [1]
- November 9
- Beer Hall Putsch; National Socialists fail to overthrow government in Germany. [1]
- November 20
- Garrett Morgan invents and patents the traffic signal. [5]
- November 22
- US President Calvin Coolidge pardons WW I German spy Lothar Witzke, sentenced to death. [1]
- December 8
- German-US friendship treaty signed. [1]
- Labour/Liberals win British parliament. [1]
- Salary and price freeze in Germany. [1]
- December 10
- Polish government of Grabski forms. [1]
- December 17
- Greek king George II overthrown by army/republic. [1]
- December 18
- International zone of Tangier set up in Morocco. [1]
- December 21
- Nepal changes from British protectorate to independent nation. [1]
- December 27
- Unsuccessful assassination attempt on prince-regent Hirohito of Japan. [1]
- December 31
- First transatlantic radio broadcast of a voice, Pittsburgh (Pennsylvania) to Manchester (England). [1]
- The chimes of Big Ben are broadcast on radio for the first time by the BBC. [1] [5]
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