Wikipedia:Selected anniversaries/February 23
This is a list of selected February 23 anniversaries that appears on the "On this day" section of the Main Page. To suggest a new item, in most cases you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial, or on a day that is or soon will be on the Main Page, please post your suggestion on the talk page instead.
Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only 5–6 events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is not generally posted this year if it is also the subject of the scheduled February 23, 2018 featured article or the February 23, 2018 featured picture.
To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.
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|Mashramani in Guyana||refimprove|
|1820 – British authorities arrested the conspirators of the Cato Street Conspiracy, an attempt to murder Prime Minister Lord Liverpool and all the British cabinet ministers.||refimprove|
|1836 – Battle of the Alamo||Save for March 6|
|1861 – President-elect of the United States Abraham Lincoln arrived secretly in Washington, D.C., for his inauguration, thwarting an alleged assassination plot in Baltimore.||refimprove section|
|1885 – Sino-French War: France gained an important victory in the Battle of Đồng Đăng in the Tonkin region of what is now Vietnam.||unreferenced section|
|1893 – Rudolf Diesel received a patent for the diesel engine.||refimprove sections|
|1927 – German theoretical physicist Werner Heisenberg wrote a letter to fellow physicist Wolfgang Pauli in which he described his uncertainty principle for the first time.||refimprove section|
|1944 – In response to an insurgency in Chechnya, the Soviet Union began the forced deportation of native Chechen and Ingush of North Caucasus to Kazakhstan and Kyrgyzstan.||expansion|
|2005 – France passed a law requiring lycée teachers to teach students "the positive role" of French colonialism, creating so much public opposition that it was repealed within a year.||unreferenced section|
|2014 – Ukrainian president Viktor Yanukovych left to Russia, marking the end of the Euromaidan protests and the start of the Crimean crisis.||multiple issues|
- 1903 – The Cuban–American Treaty was finalized, allowing the United States to lease Guantánamo Bay from Cuba in perpetuity for the purposes of operating coaling and naval stations.
- 1909 – The Silver Dart was flown off the ice of Bras d'Or Lake on Cape Breton Island, making it the first controlled powered flight in Canada.
- 1941 – Plutonium was first chemically identified by chemist Glenn T. Seaborg and his team at the University of California, Berkeley.
- 1945 – Second World War: In an Allied bombing run on Pforzheim, Germany, approximately 31% of the town's population were killed and 83% of its buildings were destroyed.
- 1945 – American photographer Joe Rosenthal took the Pulitzer Prize-winning photograph Raising the Flag on Iwo Jima during the Battle of Iwo Jima, an image that was later reproduced as the U.S. Marine Corps War Memorial.
- 1991 – The government of Thai prime minister Chatichai Choonhavan was deposed in a bloodless coup by General Sunthorn Kongsompong.
- 1739 – The identity of English highwayman Dick Turpin was uncovered by his former schoolteacher, who recognised his handwriting, leading to Turpin's arrest.
- 1847 – Mexican–American War: The United States Army used artillery to repulse the much larger Mexican army at the Battle of Buena Vista near Saltillo, Coahuila.
- 1947 – The International Organization for Standardization, responsible for worldwide industrial and commercial standards, was founded.
- 1987 – Light from SN 1987A, a supernova in the Large Magellanic Cloud, reached the Earth.
- 2007 – A Virgin express train from London Euston to Glasgow Central derailed near Grayrigg, Cumbria (accident scene pictured), killing one person and injuring thirty.