January 31 » Czechoslav Trade Union Association is founded in Prague.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
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.
December 6 » London becomes the world's first city to host licensed taxicabs.
Day of marriage May 1, 1920
The temperature on May 1, 1920 was between 3.3 °C and 16.7 °C and averaged 10.9 °C. There was 0.2 mm of rain. There was 4.9 hours of sunshine (33%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-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 26 » Former Ford Motor Company executive Henry Leland launches the Lincoln Motor Company which he later sold to his former employer.
August 13 » Polish–Soviet War: The Battle of Warsaw begins and will last till August 25. The Red Army is defeated.
August 16 » Ray Chapman of the Cleveland Indians is hit on the head by a fastball thrown by Carl Mays of the New York Yankees, and dies early the next day. Chapman was the second player to die from injuries sustained in a Major League Baseball game, the first being Doc Powers in 1909.
September 17 » The National Football League is organized as the American Professional Football Association in Canton, Ohio.
November 2 » In the United States, KDKA of Pittsburgh starts broadcasting as the first commercial radio station. The first broadcast is the result of the 1920 United States presidential election.
November 28 » FIDAC (The Interallied Federation of War Veterans Organisations), the first international organization of war veterans is established in Paris, France
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/I58462.php : accessed October 18, 2026), "Klaske Dijkstra (1897-????)".
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