January 23 » The Malolos Constitution is inaugurated, establishing the First Philippine Republic. Emilio Aguinaldo is sworn in as its first President.
February 14 » Voting machines are approved by the U.S. Congress for use in federal elections.
February 16 » Iceland's first football club, Knattspyrnufélag Reykjavíkur, is founded.
February 22 » Filipino forces led by General Antonio Luna launch counterattacks for the first time against the American forces during the Philippine–American War. The Filipinos fail to regain Manila from the Americans.
March 31 » Malolos, capital of the First Philippine Republic, is captured by American forces.
April 18 » The St. Andrew's Ambulance Association is granted a royal charter by Queen Victoria.
Day of marriage April 20, 1921
The temperature on April 20, 1921 was between -1.6 °C and 10.4 °C and averaged 5.0 °C. There was 4.1 mm of rain. There was 4.9 hours of sunshine (35%). 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.
January 20 » The first Constitution of Turkey is adopted, making fundamental changes in the source and exercise of sovereignty by consecrating the principle of national sovereignty.
March 18 » The Kronstadt rebellion is suppressed by the Red Army.
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 12 » Mikhail Tukhachevsky orders the use of chemical weapons against the Tambov Rebellion, bringing an end to the peasant uprising.
July 22 » Rif War: The Spanish Army suffers its worst military defeat in modern times to the Berbers of the Rif region of Spanish Morocco.
November 11 » The Tomb of the Unknowns is dedicated by US President Warren G. Harding at Arlington National Cemetery.
When copying data from this family tree, please include a reference to the origin: P. Heres, "Family tree Eilander", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eilander/I1099500599.php : accessed March 13, 2026), "Gerrit Jan Post (1899-????)".
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