- 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]
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- 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
- The first issue of Time magazine is published, in the USA. [1761.25] [1795.34]
- 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 12
- In New York City, Dr. Lee DeForest demonstrates a method for putting sound on motion picture film, called "phonofilm". [457]
- March 14
- Allies accept 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 14
- Ralph Peer of Okeh Records records Fiddlin' John Carson doing "The Little Old Log Cabin in the Lane", the beginning of the country music recording industry. [457]
- 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]
- (month unknown)
- Germany issues its highest denominated postage stamp of its hyper-inflation: 50 billion marks (50,000,000,000m). [1841.98]
- 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
- Powerful 15-second earthquake strikes 30 miles south of Yokohama and 50 miles south of Tokyo, Japan. About 144,000 people are killed in falling and burning buildings. Vast areas of Tokyo and Yokohama are leveled. [1483.28] [1850.29]
- 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]
- Exchange rate of German marks to US dollars: 4,200,000,000,000 to 1. [1135]
- 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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