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Wikipedia:Selected anniversaries/October 20

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This is a lists selected October 20 anniversaries that appear in 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. Before doing so, please review the selected anniversaries guidelines. If your suggestion is potentially controversial or relates to a day currently or soon to appear on the Main Page, post it on the talk page instead.

Please note:

  • Events listed on the Main Page are selected based on article quality and to provide a diverse range of topics, rather than solely on the importance or significance of the events.
  • Only four or five events are featured each day; therefore, not all important or significant events can be included.
  • An event is generally excluded if it is already the subject of the scheduled featured article, featured list or picture of the day.

To report an error in content currently on the Main Page, see Wikipedia:Main Page/Errors. If a listed event is inaccurate, please first seek consensus and update the corresponding article before making changes here.

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Ineligible

Blurb Reason
1097 – Forces of the First Crusade arrived at Antioch, beginning an eight-month siege of the city. unreferenced material
1572Eighty Years' War: Soldiers of the Spanish Tercios waded across the river Scheldt at its mouth, walking overnight in water to chest height, to relieve the siege of Goes in the Spanish Netherlands. needs more footnotes
1818 – The United Kingdom and the United States signed the Treaty of 1818, which settled the Canada–United States border on the 49th parallel between the Rocky Mountains and Lake of the Woods. refimprove section
1827 – An allied British, French, and Russian naval force destroyed a combined Ottoman and Egyptian fleet at the Battle of Navarino, a decisive moment in the Greek War of Independence. refimprove section
1883 – Peru and Chile signed the Treaty of Ancón, ending Peru's involvement in the War of the Pacific. War featured on March 23; Treaty is a stub
1961 – The Soviet Union performed the first armed test of a submarine-launched ballistic missile, launching an R-13 from a Golf-class submarine. refimprove section
1973Elizabeth II, in her capacity as Queen of Australia, formally opened the Sydney Opera House on Bennelong Point in Sydney Harbour. refimprove section
1991An urban fire killed 25 people, injured 150 others, and destroyed over 3,000 homes in the cities of Berkeley and Oakland, California. refimprove section

Eligible

Notes

October 20

Pope Pius XII
Pope Pius XII
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