Wikipedia:Selected anniversaries/May 31

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This is a list of selected May 31 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 May 31, 2019 featured article or the May 31, 2019 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.

< May 30 June 1 >

May 31: World No Tobacco Day; Feast of the Visitation in Roman Catholicism and Anglicanism

Samuel Pepys

Template:*mp 1223Mongol invasions: Mongol forces defeated a combined army of Kiev, Galich, and the Cumans on the banks of the Kalchik River in present-day Ukraine. Template:*mp 1669 – Citing poor eyesight, English naval administrator and Member of Parliament Samuel Pepys (pictured) recorded his last entry in his diary, one of the most important primary sources for the English Restoration period. Template:*mp 1889 – The South Fork Dam near Johnstown, Pennsylvania, USA failed, unleashing a torrent of 18.1 million cubic meters (4.8 billion gallons) of water that killed over 2,200 people. Template:*mp 1910 – The previously separate colonies of the Cape, Natal, Transvaal and the Orange Free State united to form the Union of South Africa, exactly 51 years before it would become the Republic of South Africa. Template:*mp 1974Syria and Israel signed a disengagement agreement to resolve the 20-day Yom Kippur War.

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