April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
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.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
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.
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.
Day of marriage June 16, 1920
The temperature on June 16, 1920 was between 11.7 °C and 25.3 °C and averaged 19.2 °C. There was 14.0 hours of sunshine (84%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-southeast. 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 2 » The second Palmer Raid, ordered by the US Department of Justice, results in 6,000 suspected communists and anarchists being arrested and held without trial.
January 8 » The steel strike of 1919 ends in failure for the Amalgamated Association of Iron, Steel and Tin Workers labor union.
January 10 » League of Nations Covenant enters into force. On January 16 the organization holds its first council meeting, in Paris.
January 28 » Foundation of the Spanish Legion.
August 31 » Polish–Soviet War: A decisive Polish victory in the Battle of Komarów.
November 12 » Italy and the Kingdom of Serbs, Croats and Slovenes sign the Treaty of Rapallo.
When copying data from this family tree, please include a reference to the origin: Gijsbertus Cornelis (Bert) Severijn, "Family tree Severijn", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-severijn/I10198.php : accessed February 13, 2026), "Jennie Hoffman (1897-????)".
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