- February 12
- Soviet troops invade Georgia. [1]
- Winston Churchill becomes British Minister of Colonies. [1]
- February 18
- British troops occupy Dublin, Ireland. [1]
- February 20
- Riza Khan Pahlevi seizes control of Iran. [1]
- February 21
- France and Poland make a secret military agreement, specifying that if Germany attacks either nation, the other will assist in defence. If Poland is attacked by Soviet Russia, France is to hold Germany in check on land and at sea. [10]
- February 23
- First US transcontinental air mail flight arrives in New York City, New York from San Francisco, California. [1]
- February 24
- First US transcontinental flight in 24 hours flying time arrives in Florida. [1]
- February 25
- Georgian SSR proclaimed. [1]
- March 1
- Rwanda ceded to England. [1]
- Sailors revolt in Kronstadt, Russia. [1]
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- March 4
- Inauguration of Warren G. Harding as US President. [472.67]
- March 7
- Red Army under Trotsky attack sailors of Kronstadt. [1]
- March 13
- Mongolia (formerly Outer Mongolia) declares independence from China. [1]
- March 17
- Dr Marie Stopes opens Britain's first birth control clinic (London). [1]
- Lenin proclaims New Economic Politics. [1]
- Sailors revolt in Kronstadt (thousands die). [1]
- March 18
- Second Peace of Riga, Poland enlarged. [1]
- Steamer Hong Kong runs aground off Swatow China killing 1,000. [1]
- March 31
- British coal miners goes on strike. [1]
- April 2
- Professor Albert Einstein lectures in New York City on his new theory of relativity. [1]
- April 11
- Turkestan ASSR is established in Russian SFSR. [1]
- April 16
- Liberal Freedom League forms in The Hague. [1]
- April 19
- Funeral of last German Emperoress, Augusta Victoria. [1]
- April 24
- First municipal elections for men and women in Belgium. [1]
- April 30
- Pope Benedict XV encyclical "On Dante" published. [1]
- May 1
- Drusian sultan Pasja al-Atrasj is elected Governor of Suwayda. [1]
- First full-length feature film with sound, Dream Street, is shown in New York City, USA. The film was made by United Artists. [55.69]
- May 2
- Beginning of third anti-German revolt in Upper-Silesia. [1]
- May 5
- Miniature newspaper first published (Brighton Gazette, 10 x 13 cm). [1]
- May 8
- Sweden abolishes capital punishment. [1]
- May 11
- Tel Aviv is first all-Jewish municipality. [1]
- May 14
- Benito Mussolini's fascists obtain 29 parliament seats in Italy. [1]
- May 17
- Belgiium and Luxembourg sign customs union. [1]
- May 19
- US Congress sharply curbs immigration, setting a national quota system. [1]
- May 24
- First parliament for Northern Ireland is elected. [1]
- British Legion is formed. [1]
- May 27
- After 84 years of British control, Afghanistan achieves sovereignty. [1]
- May 30
- Salzburg, Austria, votes to join Germany. [1]
- June 1
- Race riot in Tulsa, Oklahoma, USA (21 whites and 60 blacks killed). [1]
- June 3
- A sudden cloudburst kills 120 near Pikes Peak, Colorado, USA. [1]
- July 11
- Mongolia gains independence from China (National Day). [1]
- July 27
- Researchers at the University of Toronto led by biochemist Frederick Banting announce the discovery of the hormone insulin. [5]
- July 29
- The Council on Foreign Relations is incorporated in New York. [1096.212]
- August 3
- First aerial cropdusting, on six-acre catalpa grove infested with leaf caterpillars, at Troy, Ohio. Two days later, found to be 99 percent effective. [1] [55.7]
- August 16
- Regent Alexander becomes King of the Kingdom of the Serbs, Croats and Slovenes on the death of his father. [1268.85]
- August 23
- Emir Faisal, King of Syria, is proclaimed King of Iraq. [1215.810]
- August 25
- US signs peace treaty with Germany. [1]
- August 28
- Second Pan-African Congress meets (London, Brussels, and Paris). [1]
- September 8
- First Miss America crowned (Margaret Gorman of Washington DC). [1]
- September 21
- Gas generator explodes at Bradishe Aniline chemical works in Germany. [1]
- October 5
- Constitution of Liechtenstein comes into effect. [1]
- October 26
- US President Warren Harding appoints Solomon Porter Hood US Minister to Liberia. [1]
- November 9
- Albert Einstein is awarded the Nobel Prize in Physics for his work with the photoelectric effect. [5]
- November 12
- Washington Conference for Limitation of Armaments is held. [1]
- November 13
- US, France, Japan and British Empire sign a Pacific Treaty. [1]
- November 22
- Great Britain and Afghanistan sign a peace treaty, in which Britain recognizes the independence of Afghanistan. [992.98]
- November 28
- Ascension of 'Abdu'l-Bahá (Bahá'í festival-Qawl 6, 78). [1]
- December 1
- First US helium-filled dirigible makes first flight. [1]
- December 6
- Anglo-Irish Treaty signed; Ireland receives dominion status; partition creates Northern Ireland. [1]
- December 8
- Eamon de Valera publicly repudiates Anglo-Irish Treaty. [1]
- December 21
- In Beirut, Syria, a building is hit by a falling meteorite. [521]
- December 29
- William Lyon Mackenzie King succeeds Arthur Meighen as Canadian Prime Minister. [1]
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