January 31 » Czechoslav Trade Union Association is founded in Prague.
August 21 » Oldsmobile, an American automobile manufacturer and marque, is founded.
August 31 » Thomas Edison patents the Kinetoscope, the first movie projector.
September 11 » After months of pursuit, generals of Menelik II of Ethiopia capture Gaki Sherocho, the last king of Kaffa, bringing an end to that ancient kingdom.
November 1 » The first Library of Congress building opens its doors to the public; the library had previously been housed in the Congressional Reading Room in the U.S. Capitol.
December 30 » The British Colony of Natal annexes Zululand.
Day of marriage May 4, 1921
The temperature on May 4, 1921 was between -2.6 °C and 9.9 °C and averaged 4.3 °C. There was 0.3 mm of rain. There was 1.1 hours of sunshine (7%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west. 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 27 » The International Working Union of Socialist Parties is founded in Vienna.
May 31 » The Tulsa race massacre kills at least 39, but other estimates of black fatalities vary from 55 to about 300.
June 28 » Serbian King Alexander I proclaims the new constitution of the Kingdom of Serbs, Croats and Slovenes, known thereafter as the Vidovdan Constitution.
July 23 » The Communist Party of China (CPC) is established at the founding National Congress.
July 29 » Adolf Hitler becomes leader of the National Socialist German Workers Party.
October 18 » The Crimean Autonomous Soviet Socialist Republic is formed as part of the Russian Soviet Federative Socialist Republic.
When copying data from this family tree, please include a reference to the origin: Ton Van Es, "Family tree van Es", database, Genealogy Online (https://www.genealogieonline.nl/van-es-stamboom/I4743.php : accessed February 15, 2026), "Catharina Maria Lens (1897-????)".
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