January 18 » An X-ray generating machine is exhibited for the first time by H. L. Smith.
March 2 » The Battle of Adwa: The Italian Army defeated by the Ethiopian Army in Adwa, Tigray, Ethiopia.
May 26 » Charles Dow publishes the first edition of the Dow Jones Industrial Average.
September 22 » Queen Victoria surpasses her grandfather King George III as the longest reigning monarch in British history.
December 14 » The Glasgow Underground Railway is opened by the Glasgow District Subway Company.
December 30 » Canadian ice hockey player Ernie McLea scores the first hat-trick in Stanley Cup play, and the Cup-winning goal as the Montreal Victorias defeat the Winnipeg Victorias 6–5.
Day of marriage June 1, 1921
The temperature on June 1, 1921 was between 9.2 °C and 23.9 °C and averaged 17.0 °C. There was 12.8 hours of sunshine (78%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north. 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 24 » The 1921 Women's Olympiad begins in Monte Carlo, first international women's sports event.
July 23 » The Communist Party of China (CPC) is established at the founding National Congress.
August 14 » Tannu Uriankhai, later Tuvan People's Republic is established as a completely independent country (which is supported by Soviet Russia).
September 8 » Margaret Gorman, a 16-year-old, wins the Atlantic City Pageant's Golden Mermaid trophy; pageant officials later dubbed her the first Miss America.
October 18 » The Crimean Autonomous Soviet Socialist Republic is formed as part of the Russian Soviet Federative Socialist Republic.
November 14 » The Communist Party of Spain is founded, and issues the first edition of Mundo obrero.
When copying data from this family tree, please include a reference to the origin: Alfred Groot, "Family tree Groot", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-groot/I1544.php : accessed January 2, 2026), "Johannes "Hans" Joling, (1896-????)".
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