Wikipedia:Selected anniversaries/June 21
This is a list of selected June 21 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 June 21, 2017 featured article or the June 21, 2017 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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|1582 – Sengoku period: Oda Nobunaga, the most powerful of the Japanese daimyo, was forced to commit suicide by his own general Akechi Mitsuhide.||refimprove|
|1798 – Over 15,000 British soldiers launched an attack on Vinegar Hill, the largest camp and headquarters of the County Wexford United Irish rebels, marking a turning point in the Irish Rebellion.||needs more footnotes|
|1798 – New Hampshire ratified the U.S. Constitution and was admitted as the ninth U.S. state.||unreferenced section|
|1813 – Peninsular War: The Marquess of Wellington's combined British, Portuguese, and Spanish allied army defeated the French near Vitoria, Spain.||needs more footnotes|
|1973 – The U.S. Supreme Court delivered its decision in the landmark case Miller v. California, establishing the "Miller test" for determining what is obscene material.||more footnotes|
|1985 – Greenland officially adopted its own flag, adding support to its independence movement from Denmark.||refimprove|
|2000 – The controversial British law known as Section 28, prohibiting the "promotion" of homosexuality, was repealed.||cleanup, also appears on May 24|
- 217 BC – Second Punic War: The Carthaginians under Hannibal executed one of the largest military ambushes in history when they overwhelmingly defeated the Romans.
- 1826 – Greek War of Independence: A combined Egyptian and Ottoman army began their invasion of the Mani Peninsula, but they were initially held off by the Maniots at the fortifications of Vergas.
- 1864 – New Zealand Wars: British victory in the Battle of Te Ranga brought the Tauranga Campaign to an end.
- 1898 – In a bloodless event during the Spanish–American War, the United States captured Guam from Spain.
- 1919 – Admiral Ludwig von Reuter scuttled the German High Seas Fleet in Scapa Flow to prevent the ships from being seized and divided amongst the Allied Powers.
- 1948 – The Manchester Small-Scale Experimental Machine, the world's first stored-program computer, ran its first computer program.
- 1964 – Three civil rights workers were lynched by members of the Ku Klux Klan near Philadelphia, Mississippi, US.
- 1529 – War of the League of Cognac: The French army under Francis de Bourbon was destroyed in Lombardy, present-day Italy, by the Spanish army.
- 1734 – A black slave known as Marie-Joseph Angélique, having been convicted of setting the fire that destroyed much of Montreal, was tortured and then hanged in New France.
- 1848 – In the Wallachian Revolution, Ion Heliade Rădulescu and Christian Tell proclaimed a new republican government.
- 1919 – During the Winnipeg general strike in Winnipeg, Manitoba, Canada, members of the Royal Northwest Mounted Police charged into the crowd of strikers on horseback, beating them with clubs and firing weapons.
- 1963 – Italian cardinal Giovanni Battista Montini was elected as Pope Paul VI.
- 2004 – SpaceShipOne (pictured) completed the first privately funded human spaceflight.