March 16 » In Melbourne the representatives of five colonies adopted a constitution, which would become the basis of the Commonwealth of Australia.
April 25 » Spanish–American War: The United States declares war on Spain.
September 13 » Hannibal Goodwin patents celluloid photographic film.
October 14 » The steam ship SSMohegan sinks near the Lizard peninsula, Cornwall, killing 106.
October 18 » The United States takes possession of Puerto Rico from Spain.
December 10 » Spanish–American War: The Treaty of Paris is signed, officially ending the conflict.
Day of death December 9, 1921
The temperature on December 9, 1921 was between 0.2 °C and 9.7 °C and averaged 6.2 °C. There was 2.2 mm of rain. There was 5.2 hours of sunshine (66%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
February 12 » Bolsheviks launch a revolt in Georgia as a preliminary to the Red Army invasion of Georgia.
March 20 » The Upper Silesia plebiscite was a plebiscite mandated by the Versailles Treaty to determine a section of the border between Weimar Germany and Poland.
June 15 » Bessie Coleman earns her pilot's license, becoming the first female pilot of African-American descent.
August 14 » Tannu Uriankhai, later Tuvan People's Republic is established as a completely independent country (which is supported by Soviet Russia).
October 5 » The World Series is the first to be broadcast on radio.
November 4 » The Saalschutz Abteilung (hall defense detachment) of the Nazi Party is renamed the Sturmabteilung (storm detachment) after a large riot in Munich.
When copying data from this family tree, please include a reference to the origin: Hendrik Dreyer, "Dreyer Tree", database, Genealogy Online (https://www.genealogieonline.nl/dreyer-tree/I16213.php : accessed January 19, 2026), "Christina Johanna Sophia van Aardt (1898-1921)".
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