March 14 » Pelican Island National Wildlife Refuge, the first national wildlife refuge in the US, is established by President Theodore Roosevelt.
June 11 » A group of Serbian officers stormed the royal palace and assassinated King Alexander Obrenović and his wife, Queen Draga.
June 19 » Benito Mussolini, at the time a radical Socialist, is arrested by Bern police for advocating a violent general strike.
July 23 » The Ford Motor Company sells its first car.
August 18 » German engineer Karl Jatho allegedly flies his self-made, motored gliding airplane four months before the first flight of the Wright brothers.
August 29 » The Slava, the last of the five Borodino-class battleships, is launched.
Day of marriage May 21, 1921
The temperature on May 21, 1921 was between 2.0 °C and 19.1 °C and averaged 12.6 °C. There was 12.7 hours of sunshine (80%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. 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 8 » Spanish Prime Minister Eduardo Dato Iradier is assassinated while exiting the parliament building in Madrid.
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.
July 11 » A truce in the Irish War of Independence comes into effect.
October 26 » The Chicago Theatre opens.
October 29 » The Harvard University football team loses to Centre College, ending a 25-game winning streak. This is considered one of the biggest upsets in college football.
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: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I201460.php : accessed February 17, 2026), "Zwaantje Arends (1903-)".
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