- January 17
- Paul Deschanel elected President of France. [1]
- January 19
- Alexandre Millerand forms French government. [1]
- US Senate votes against membership in League of Nations. [1]
- January 20
- Dutch second Chamber passes school laws. [1]
- January 23
- Dutch government refuses to turn over ex-Kaiser Wilhelm I of Germany to the allies. [1]
- January 26
- Matthias Enzberger, German minister of finance, is murdered. [1]
- January 31
- First Ukrainian daily newspaper in US (New York City, New York) begins publication. [1]
- February 1
- First commercial armored car introduced (Saint Paul, Minnesota). [1]
- Royal Canadian Mounted Police forms as Royal Northwest Mounted Police merge with Dominion Police. [1]
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- February 2
- France occupies (German) Memel territory. [1]
- Tarto/Dorpat peace treaty: USSR recognizes Estonian independence. [1]
- February 4
- First flight from London, England to South Africa takes-off (takes 1.5 months). [1]
- February 6
- Saarland is administrated by League of Nations. [1]
- February 7
- Alexander Koltsjak, Admiral/leader Russian counter-revolutionary, is executed. [1]
- February 8
- Swiss men vote against women's suffrage. [1]
- February 9
- International treaty recognizes Norwegian sovereignty over Svalbard. [1]
- February 12
- 14,000 Rotterdam/Amsterdam harbor workers strike. [1]
- February 13
- League of Nations recognizes perpetual neutrality of Switzerland. [1]
- Switzerland rejoins League of Nations. [1]
- February 19
- Netherlands joins League of Nations. [1]
- February 22
- In Emeryville, New York, the first dog race track to employ an imitation rabbit opens. [1] [5]
- February 24
- NSDAP (National Socialist German Workers' Party) begins at Hofbräuhaus, Münich, Germany. [1]
- Peace treaty gives Estonia independence. [1]
- March 1
- Hungary becomes a kingdom again, under regent Admiral Miklos Horthy. [1] [1146.714]
- March 4
- Last day of Julian civil calendar in Greece. [1]
- March 8
- Denmark and Cuba join the League of Nations. [1]
- March 13
- Wolfgang Kapp's coup attempt in Berlin, Germany, fails. [1]
- March 18
- Greece adopts the Gregorian calendar. [1]
- March 19
- US Senate rejects Treaty of Versailles for second time refusing to ratify League of Nations' covenant (maintaining isolation policy). [1]
- March 20
- First flight from London to South Africa lands (1.5 months). [1]
- Venustiano Carranza, President of Mexico (1915-20), murdered at age 60. [1]
- March 23
- Perserikatan Communist of India (PKI) political party forms. [1]
- March 25
- Greek Independence Day. [1]
- March 27
- Hermann Müller becomes German chancellor (SPD). [1]
- March 28
- Thomas Masaryk elected President of Czechoslovakia. [1]
- March 31
- British parliament accepts Irish "Home Rule"-law. [1]
- April 1
- Church disestablished in Wales. [1]
- April 4
- Arabs attack Jews in Jerusalem. [1]
- April 6
- French troops attack Main/Darmstadt/Hanau. [1]
- April 15
- The size of the Canadian 1-cent coin is reduced to a 3/4-inch diameter, similar to the American cent. [3]
- April 20
- Balfour Declaration recognized, makes Palestine a British Mandate. [1]
- Tornadoes kill 219 in Alabama and Mississippi, USA. [1]
- April 23
- Turkish Grand National Assembly first meets, in Ankara. [1]
- April 24
- British Mandate over Palestine goes into effect (lasts 28 years). [1]
- Polish troops attack Ukraine. [1]
- April 25
- The League of Nations grants a mandate to the United Kingdom to administer Iraq. [1215.810]
- April 27
- Pogrom leader Petljoera declares Ukraine independence. [1]
- April 28
- Azerbaijan SSR joins the USSR (first time). [1]
- May 1
- Belgian-Luxembourg toll tunnel opens. [1]
- May 5
- German-Latvian peace treaty signed. [1]
- Polish troops occupy Kiev, Ukraine. [1]
- May 7
- USSR recognizes independence of Georgia. [1]
- May 16
- Joan of Arc (Jeanne d'Arc) canonized a saint in Rome. [1]
- Spanish bullfighter Joselito is fatally gored fighting his last bull. [1]
- May 17
- First De Havilland double-decker flight (London) lands in Schiphol. [1]
- First flight by Dutch airlines KLM (Koninklijke-Luchtvaart-Maatschappij). [1]
- May 20
- Montreal, Quebec, Canada station XWA broadcasts the first regularly scheduled radio programming in North America. [5]
- May 23
- Pope Benedictus XV publishes encyclical Pacem Dei. [1]
- May 27
- Tatar ASSR is established in Russian SFSR. [1]
- June 4
- Hungarian delegates at Versailles, France, sign peace treaty. [1146.715]
- June 24
- Chuvash Autonomous Region formed in RSFSR. [1]
- (month unknown)
- An iron meteorite weighing about 60 tons is found near Groot Fontein in Namibia, the largest meteorite ever found. [523]
- July 3
- Royal Air Force holds an air display at Hendon, England. [1]
- July 12
- US Presidential Proclamation declares Panama Cana officially open, as required in Panama Canal Act of 1912. [1119.113]
- Lithuania and USSR sign peace treaty, Lithuania becomes independent republic. [1]
- July 15
- The Manila Mint in the Philippines officially opens for business. First coin struck, by US governor-general Francis Burton Harrison, is a bronze 1-centavo coin. This is the first official coinage of the Philippines under US administration. [442.24] [513.22] [756.60]
- July 23
- Kenya becomes a British crown colony. [1]
- July 25
- The first transatlantic two-way radio broadcast takes place, by the Canadian Marconi Company from Signal Hill, Newfoundland to the SS Victoria. [5] [457]
- August 20
- First US commercial radio, 8MK (WWJ), Detroit, Michigan begins daily broadcasting. [1] [5]
- August 31
- The first news radio program is broadcast in Detroit, Michigan. [5]
- September 2
- Greece formally cedes island of Saseno to Italy. [612.31]
- September 4
- Last day of Julian civil calendar (in parts of Bulgaria). [1]
- September 8
- US Air Mail service begins (New York City to San Francisco). [1]
- October 14
- Part of Petsamo province ceded by Soviet Union to Finland. [1]
- October
- Cunard Line's Caronia embarks from Tilbury, England, with a record number of passengers: 1500. [274.13]
- October 27
- League of Nations moves headquarters to Geneva, Switzerland. [1]
- November 2
- KDKA (Pittsburgh) goes on the air as first US commercial radio station. [1]
- Warren G Harding is elected President of the USA. [1]
- November 13
- Hungarian parliament ratifies peace treaty. [1146.715]
- November 15
- Free City of Danzig established under League of Nations protection. [1]
- League of Nations holds first meeting, in Geneva, Switzerland. [1]
- November 16
- Qantas (Queensland and Northern Territory Aerial Services Limited), the national airline of Australia, registers as an aerial carrier. [5]
- Postage meter first used in US in lieu of postage stamps. [1]
- December 3
- Turkey and Armenia agree to peace treaty. [1]
- December 7
- USPD-KPD parties merge into Vereinigte Communist Party of Germany. [1]
- December 10
- President Woodrow Wilson receives Nobel Peace Prize. [1]
- December 13
- F Pease's interferometer measures first stellar diameter (Betelgeuse). [1]
- League of Nations establishes International Court of Justice in The Hague. [1]
- Netherlands breaks contact with kingdoms of Serbia, Croatia, and Slavia. [1]
- December 16
- Over 180,000 die when 8.6 earthquake destroys 15,000 square miles (Kansu, China). [1]
- December 17
- British Empire receives League of Nations mandate to Nauru. [1]
- Japan receives League of Nations mandate over Pacific islands. [1]
- South Africa receives League of Nations mandate over South West Africa. [1]
- December 23
- King George V signs Home Rule Act. [1]
- Ireland is divided into two parts, each with its own parliament. [1]
- December 24
- Enrico Caruso gives his last public performance (New York City, New York). [1]
- December 29
- The Netherlands and Venezuela recover diplomatic relations. [1]
- Yugoslav government bans communist party. [1]
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