March 14 » The Gold Standard Act is ratified, placing the United States currency on the gold standard.
March 18 » AFC Ajax Amsterdam, The Netherlands's biggest and most successful football club, was founded.
May 17 » The children's novel The Wonderful Wizard of Oz, by L. Frank Baum, is first published in the United States. The first copy is given to the author's sister.
June 14 » Hawaii becomes a United States territory.
July 2 » Jean Sibelius' Finlandia receives its première performance in Helsinki with the Helsinki Philharmonic Society conducted by Robert Kajanus.
December 19 » Hopetoun Blunder: The first Governor-General of Australia John Hope, 7th Earl of Hopetoun, appoints Sir William Lyne premier of the new state of New South Wales, but he is unable to persuade other colonial politicians to join his government and is forced to resign.
Day of death August 20, 1900
The temperature on August 20, 1900 was about 20.2 °C. The airpressure was 76 cm mercury. The atmospheric humidity was 87%. Source: KNMI
January 24 » Second Boer War: Boers stop a British attempt to break the Siege of Ladysmith in the Battle of Spion Kop.
January 31 » Datu Muhammad Salleh is killed in Kampung Teboh, Tambunan, ending the Mat Salleh Rebellion.
May 17 » Second Boer War: British troops relieve Mafeking.
June 21 » Boxer Rebellion. China formally declares war on the United States, Britain, Germany, France and Japan, as an edict issued from the Empress Dowager Cixi.
October 9 » The Cook Islands become a territory of the United Kingdom.
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: Johan Jonker, "Family tree Jonker", database, Genealogy Online (https://www.genealogieonline.nl/jonker-stamboom/I112.php : accessed January 14, 2026), "Willem van Markensteijn (1900-1900)".
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