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Wikipedia:Selected anniversaries/June 15

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This is a list of selected June 15 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. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon 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 four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article or picture of the day.

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.

June 14 June 16
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Ineligible

Blurb Reason
Flag Day in Denmark needs more footnotes
1219Northern Crusades: According to a popular Danish legend, the Dannebrog (Flag of Denmark), today one of the oldest state flags in the world still in use, fell from the sky and gave the Danish forces renewed hope to defeat the Estonians at the Battle of Lyndanisse. unreferenced section
1667 – French physician Jean-Baptiste Denys administered the first fully documented human blood transfusion, giving the blood of a sheep to a 15-year-old boy. refimprove section
1670 – The first stone of Fort Ricasoli in Kalkara, Malta, was laid by the Order of Saint John. "Order of St John" not sourced
1815 – The Duchess of Richmond held a ball in Brussels, Belgium, that was described as "the most famous ball in history". unreferenced passages in "Cultural influences"
1844 – American inventor Charles Goodyear received a patent for vulcanization, a process to strengthen rubber. unreferenced section
1846 – To settle the Oregon boundary dispute, the United Kingdom and the United States signed the Oregon Treaty, extending the United States–British North America border west along the 49th parallel north that was first established by the Treaty of 1818. refimprove
1904 – The steamship General Slocum caught fire in New York City's East River and burned uncontrollably, killing over 1,000 people. trivial pop culture listings
1919 – After nearly 16 hours in the air, the Vickers Vimy flown by John Alcock and Arthur Whitten Brown crash-landed in County Galway, Ireland, completing the first non-stop transatlantic flight. unsourced sections
1944 – In the Saskatchewan general election, the Co-operative Commonwealth Federation led by Tommy Douglas won enough seats in the Legislative Assembly to form the first socialist government in North America. 8 {cn} tags
1954 – The Union of European Football Associations, the administrative and controlling body for European football, was founded in Basel, Switzerland. refimprove section

Eligible

Notes

June 15: Day of Arafah (Islam, 2024); King's Official Birthday in the United Kingdom (2024)

Sallie Gardner at a Gallop
Sallie Gardner at a Gallop
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