January 23 » The Malolos Constitution is inaugurated, establishing the First Philippine Republic. Emilio Aguinaldo is sworn in as its first President.
February 4 » The Philippine–American War begins with the Battle of Manila.
March 30 » German Society of Chemistry issues an invitation to other national scientific organizations to appoint delegates to the International Committee on Atomic Weights.
July 26 » Ulises Heureaux, the 27th President of the Dominican Republic, is assassinated.
September 13 » Henry Bliss is the first person in the United States to be killed in an automobile accident.
December 11 » Second Boer War: In the Battle of Magersfontein the Boers commanded by general Piet Cronjé inflict a defeat on the forces of the British Empire commanded by Lord Methuen trying to relieve the Siege of Kimberley.
Day of death February 20, 1900
The temperature on February 20, 1900 was about 8.0 °C. The airpressure was 73 cm mercury. The atmospheric humidity was 69%. Source: KNMI
April 30 » Hawaii becomes a territory of the United States, with Sanford B. Dole as governor.
May 18 » The United Kingdom proclaims a protectorate over Tonga.
May 23 » American Civil War: Sergeant William Harvey Carney is awarded the Medal of Honor for his heroism in the Assault on the Battery Wagner in 1863.
June 14 » The second German Naval Law calls for the Imperial German Navy to be doubled in size, resulting in an Anglo-German naval arms race.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
December 18 » The Upper Ferntree Gully to Gembrook, Victoria Narrow-gauge (2ft 6 in or 762mm) Railway (now the Puffing Billy Railway) in Victoria, Australia is opened for traffic.
When copying data from this family tree, please include a reference to the origin: Nienke Oudbier, "Descendants van de Vlag1", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-oudbier/I3968.php : accessed February 26, 2026), "Maria Hendrika Proper (1899-1900)".
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