January 31 » Czechoslav Trade Union Association is founded in Prague.
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.
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 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.
Day of marriage September 25, 1920
The temperature on September 25, 1920 was between 10.8 °C and 15.8 °C and averaged 13.7 °C. There was 0.1 mm of rain. The average windspeed was 2 Bft (weak wind) and was prevailing from the southwest. 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 7 » The New York State Assembly refuses to seat five duly elected Socialist assemblymen.
January 16 » The League of Nations holds its first council meeting in Paris, France.
February 29 » Czechoslovak National Assembly adopts the Constitution.
May 16 » In Rome, Pope Benedict XV canonizes Joan of Arc.
August 11 » The Latvian–Soviet Peace Treaty, which relinquished Russia's authority and pretenses to Latvia, is signed, ending the Latvian War of Independence.
August 19 » The Tambov Rebellion breaks out, in response to the Bolshevik policy of Prodrazvyorstka.
Day of death June 4, 1966
The temperature on June 4, 1966 was between 8.2 °C and 26.1 °C and averaged 18.2 °C. There was 10.4 hours of sunshine (63%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south-southwest. Source: KNMI
March 17 » Off the coast of Spain in the Mediterranean, the DSVAlvin submarine finds a missing American hydrogen bomb.
April 21 » Rastafari movement: Haile Selassie of Ethiopia visits Jamaica, an event now celebrated as Grounation Day.
June 14 » The Vatican announces the abolition of the Index Librorum Prohibitorum ("index of prohibited books"), which was originally instituted in 1557.
July 30 » England defeats West Germany to win the 1966 FIFA World Cup at Wembley Stadium after extra time.
December 8 » The Greek ship SSHeraklion sinks in a storm in the Aegean Sea, killing over 200.
December 26 » The first Kwanzaa is celebrated by Maulana Karenga, the chair of Black Studies at California State University, Long Beach.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I82028.php : accessed December 26, 2025), "Tjerk Mulder (1897-1966)".
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