Wikipedia:Selected anniversaries/May 25

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 * 1644 – Ming–Qing transition: Ming general Wu Sangui allowed the invading Manchu to cross the Great Wall of China (pictured), enabling them to capture Beijing and establish the Qing dynasty.
 * 1782 – American Revolutionary War: US Colonel William Crawford began a failed expedition to destroy British-allied American Indian towns along the Sandusky River in the Ohio Country.
 * 1787 – The Constitutional Convention met in Philadelphia with the intention of revising the Articles of Confederation of the United States.
 * 1810 – The Primera Junta, the first independent government in Argentina, was established in an open cabildo in Buenos Aires, marking the end of the May Revolution.
 * 1878 – Gilbert and Sullivan's comic opera H.M.S. Pinafore (poster featured) premiered at the Opera Comique in London.
 * 1895 – Oscar Wilde was sentenced by Alfred Wills to two years of hard labor for gross indecency.
 * 1936 – Employees of the Remington Rand company began an 11-month strike action, during which time the company executives developed the notorious "Mohawk Valley formula" to intimidate the strikers.
 * 1940 – Second World War: German troops captured Boulogne-sur-Mer, France, forcing British forces to evacuate via Dunkirk.
 * 1955 – Joe Brown and George Band, members of the British Kangchenjunga expedition, made the first ascent of the world's third-highest mountain but deliberately did not set foot on the summit.
 * 1961 – In an address to Congress, U.S. president John F. Kennedy announced his support for the Apollo program, with "the goal, before this decade is out, of landing a man on the Moon and returning him safely to the Earth".
 * 1962 – The Baltimore Steam Packet Company, the last overnight steamboat service in the United States, went out of business.
 * 1967 – Having purged a group of rivals, Supreme Leader of North Korea Kim Il-sung delivered the "May 25 teaching", entrenching his son Kim Jong-il as his designated successor.
 * 1979 – Six-year-old Etan Patz disappeared on his way to school in New York City, and later became one of the first missing children to have his picture featured on milk cartons.
 * 2011 – The final episode of The Oprah Winfrey Show, the highest-rated daytime talk show in U.S. television history, was broadcast.
 * 2012 – In a test flight, SpaceX's Dragon became the first commercial spacecraft to rendezvous and berth with the International Space Station.
 * 2013 – Naxalite insurgents of the Communist Party of India (Maoist) attacked a convoy of Indian National Congress leaders in the state of Chhattisgarh, causing at least 27 deaths.
 * 2020 – George Floyd, an African-American man, was murdered during an arrest by a white police officer in Minneapolis, sparking protests in the U.S. and other countries.
 * Born/died: | Flann Sinna |d|916| Princess Helena of the United Kingdom |b|1846| Naim Frashëri |b|1846| Günther Lütjens |b|1889| Elizabeth Kane |d|1909| Sonia Rykiel |b|1930| Ian McKellen |b|1939| Bülent Arınç |b|1948| Elisabeth Geleerd |d|1969| Ruby Payne-Scott |d|1981