June 16 » A treaty annexing the Republic of Hawaii to the United States is signed; the Republic would not be dissolved until a year later.
August 2 » Anglo-Afghan War: The Siege of Malakand ends when a relief column is able to reach the British garrison in the Malakand states.
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.
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.
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.
January 9 » Greco-Turkish War: The First Battle of İnönü, the first battle of the war, begins near Eskişehir in Anatolia.
March 1 » The Australian cricket team captained by Warwick Armstrong becomes the first team to complete a whitewash of The Ashes, something that would not be repeated for 86 years.
March 8 » Spanish Prime Minister Eduardo Dato Iradier is assassinated while exiting the parliament building in Madrid.
March 21 » The New Economic Policy is implemented by the Bolshevik Party in response to the economic failure as a result of war communism.
July 11 » A truce in the Irish War of Independence comes into effect.
September 21 » A storage silo in Oppau, Germany, explodes, killing 500–600 people.
When copying data from this family tree, please include a reference to the origin: Bert de Jonge, "Family tree De Jonge", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-de-jonge/I268.php : accessed February 7, 2026), "Klaas van Dam (1897-????)".
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