- January 11
- Julio Antonio Mella, Cuban revolutionary, murdered at about age 28. [1]
- January 12
- Seatrain (railroad cars on ships) service begins, New Orleans, Louisiana to Havana, Cuba. [1]
- January 14
- Afghan King Amanullah is forced to resign. [1]
- January 17
- Popeye makes first appearance, in comic strip Thimble Theatre. [1]
- January 18
- Josef Stalin proposes to ban Leon Trotsky from the Politburo. [1]
- January 20
- First feature talking motion picture taken outdoors, In Old Arizona. [1]
- January 26
- Indian National Congress proclaims goal for India's independence. [1]
- January 31
- Leon Trotsky expelled from Russia to Turkey. [1]
- February 3
- Revolutionary Socialist Party forms in Amsterdam, Netherlands. [1]
- February 9
- A Protocol (Litvinov Pact) renouncing war as an instrument of national policy is signed by the Soviet Union, Estonia, Latvia, Poland, and Romania. [10]
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- February 11
- The Latern Treaty creates the Vatican (world's smallest country), giving sovereignty of the Vatican to the Holy See. [1] [408.109]
- February 14
- Saint Valentine's Day Massacre in Chicago, Illinois, USA; seven gangsters killed. [1]
- February 19
- Medical diathermy machine first used, in Schenectady, New York. [1]
- February 20
- American Samoa organized as a territory of US. [1]
- February 26
- The Grand Tetons in Wyoming is established as a national park in the United States. [1] [5] [129]
- February 27
- Russia and US sign trade agreement. [1]
- Turkey signs Litvinov-pact. [1]
- March 4
- Herbert Hoover inaugurated as 31st US President. [1]
- March 6
- Turkey and Bulgaria sign friendship treaty. [1]
- March 8
- US worker union commission reports of slavery in Liberia. [1]
- March 17
- General Motors acquires German auto manufacturer Adam Opel. [1]
- Spanish dictator Primo de Rivera closes university of Madrid. [1]
- March 22
- US Coast Guard vessel sinks Canadian schooner suspected of carrying liquor. [1]
- March 28
- Democratic constitution goes into effect in Ecuador. [1]
- April 1
- Austrian government of Ignaz Seipel falls. [1]
- April 3
- Persia agrees to Litvinov Pact. [1]
- April 5
- Lithuania signs Litvinov-pact. [1]
- April 11
- Loetafoon celluloid film system demonstrated in Amsterdam. [1]
- April 18
- Palace for People's industry in Amsterdam devastated by fire. [1]
- April 24
- First non-stop England-to-India flight takes-off. [1]
- Thorvald Stauning becomes premier of Denmark. [1]
- April 26
- First non-stop England to India flight lands. [1]
- April 30
- Earnest Streeruwitz becomes chancellor of Austria. [1]
- May 1
- Farm workers' strike begins in East-Groningen. [1]
- Police kill 19 Mayday demonstrators in Berlin, Germany. [1]
- May 3
- Prussia bans anti-fascists. [1]
- May 8
- Jan Mayen island, 500 km NNE of Iceland, is incorporated into Norway. [1]
- May 12
- Pulitzer prize awarded to Julia Peterkin (Scarlet Sister Mary). [1]
- May 15
- Fire in X-ray film stock kills 125 at Crile Clinic (Cleveland, Ohio, USA). [1]
- May 19
- General Feng Yu-Xiang of China declares war on Chiang Kai-Shek Government. [1]
- June 3
- Border dispute between Peru and Chile resolved. [1]
- June 7
- Vatican City becomes a soverign state. [1]
- June 27
- First color TV demonstration (New York City). [1]
- June 29
- First high-speed jet wind tunnel completed, at Langley Field, California, USA. [1]
- July
- Maiden voyage of North German Lloyd's Bremen to New York completed in record time: 4 days, 16 hours, 42 minutes. [260.48] [274.13]
- July 24
- The Treaty of Paris becomes effective, with 31 more countries signing compliance. [10]
- President Herbert Hoover proclaims Kellogg-Briand Pact which renounces war. [1]
- August 8
- German airship Graf Zeppelin begins a round-the-world flight from Lakehurst, New Jersey, USA. [1]
- August 29
- German airship Graf Zeppelin arrives back at Lakehurst, New Jersey, USA, completing a round-the-world flight. [1]
- September 3
- The Dow Jones Industrial Average hits a high point of 381.17. (This pre-crash high is not surpassed until 1954, adjusted for inflation.) [227]
- September 25
- Lieutenant Jimmy Doolittle performs the first blind flight at Mitchell Field in New York, proving that full Instrument Flying from take off to landing is possible. [5] (September 24 [1])
- September 30
- First manned rocket plane flight (by auto maker Fritz von Opel). [1]
- October 3
- King Alexander I changes the name of the Kingdom of Serbs, Croats, and Slovenes to Kingdom of Yugoslavia. [1] [1286] [1321.10]
- October 23
- The first North American transcontinental air service begins between New York City and Los Angeles, California. [5]
- October 24
- First day of New York stock market crash, Black Thursday. [1] [555.30] [1321.11]
- October 28
- First child born in aircraft, in Miami, Florida, USA. [1]
- New York Stock Enchange drops 12.9 percent. [905.26]
- October 29
- "Black Tuesday" New York stock market crashes, triggers "Great Depression". [1] [450.52]
- November 18
- Large earthquake in Atlantic breaks Transatlantic cable in 28 places. [1]
- December 1
- Game of BINGO invented by Edwin S Lowe. [1]
- December 2
- First skull of Peking man found, 50km out of Peking at Tsjoe Koe Tien. [1]
- December 6
- Turkey introduces female suffrage. [1]
- December 8
- In Zvezvan, Yugoslavia, a falling meteorite kills one person in a bridal party. [521]
- December 14
- Alexander Zaimis elected President of Greece. [1]
- December 29
- Indonesian police arrest Sukarno and 100s PNI-leaders. [1]
- December 31
- Pope Pius XI publishes encyclical Divini illius magistri. [1]
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