January 1 » New York, New York annexes land from surrounding counties, creating the City of Greater New York. The four initial boroughs, Manhattan, Brooklyn, Queens, and The Bronx, are joined on January 25 by Staten Island to create the modern city of five boroughs.
June 12 » Philippine Declaration of Independence: General Emilio Aguinaldo declares the Philippines' independence from Spain.
August 13 » Spanish–American War: Spanish and American forces engage in a mock battle for Manila, after which the Spanish commander surrendered in order to keep the city out of Filipino rebel hands.
September 18 » The Fashoda Incident triggers the last war scare between Britain and France.
November 3 » France withdraws its troops from Fashoda (now in Sudan), ending the Fashoda Incident.
December 26 » Marie and Pierre Curie announce the isolation of radium.
Day of death May 31, 1921
The temperature on May 31, 1921 was between 11.0 °C and 21.5 °C and averaged 16.0 °C. There was 0.2 mm of rain. There was 3.1 hours of sunshine (19%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the southwest. 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.
March 18 » The second Peace of Riga is signed between Poland and the Soviet Union.
March 19 » Irish War of Independence: One of the biggest engagements of the war takes place at Crossbarry, County Cork. About 100 Irish Republican Army (IRA) volunteers escape an attempt by over 1,300 British forces to encircle them.
March 21 » The New Economic Policy is implemented by the Bolshevik Party in response to the economic failure as a result of war communism.
June 30 » U.S. President Warren G. Harding appoints former President William Howard Taft as Chief Justice of the United States.
July 11 » The Red Army captures Mongolia from the White Army and establishes the Mongolian People's Republic.
July 27 » Researchers at the University of Toronto, led by biochemist Frederick Banting, prove that the hormone insulin regulates blood sugar.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I134648.php : accessed January 1, 2026), "François Anthonij Witteveen (1898-1921)".
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