February 28 » Queen Ranavalona III, the last monarch of Madagascar, is deposed by a French military force.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
August 21 » Oldsmobile, an American automobile manufacturer and marque, is founded.
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
September 10 » Lattimer massacre: A sheriff's posse kills 19 unarmed striking immigrant miners in Lattimer, Pennsylvania, United States.
Day of marriage May 14, 1921
The temperature on May 14, 1921 was between 8.5 °C and 25.0 °C and averaged 16.3 °C. There was 10.5 hours of sunshine (67%). The average windspeed was 2 Bft (weak wind) 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 21 » Constituent Assembly of the Democratic Republic of Georgia adopts the country's first constitution.
February 27 » The International Working Union of Socialist Parties is founded in Vienna.
April 2 » The Autonomous Government of Khorasan, a military government encompassing the modern state of Iran, is established.
June 28 » Serbian King Alexander I proclaims the new constitution of the Kingdom of Serbs, Croats and Slovenes, known thereafter as the Vidovdan Constitution.
August 23 » British airship R-38 experiences structural failure over Hull in England and crashes in the Humber Estuary. Of her 49 British and American training crew, only four survive.
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: Claudia Vreugdenhil, "Family tree Strootman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-strootman/I1404.php : accessed March 13, 2026), "Arendina HARTMAN (1897-????)".
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