January 18 » An X-ray generating machine is exhibited for the first time by H. L. Smith.
March 1 » Henri Becquerel discovers radioactive decay.
March 2 » The Battle of Adwa: The Italian Army defeated by the Ethiopian Army in Adwa, Tigray, Ethiopia.
May 27 » The F4-strength St. Louis–East St. Louis tornado hits in St. Louis, Missouri, and East St. Louis, Illinois, killing at least 255 people and causing over $10-million in damage.
June 2 » Guglielmo Marconi applies for a patent for his wireless telegraph.
July 28 » The city of Miami, Florida is incorporated.
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 23 » The Netherlands refuses to surrender the exiled Kaiser Wilhelm II of Germany to the Allies.
February 13 » The Negro National League is formed.
April 15 » Two security guards are murdered during a robbery in South Braintree, Massachusetts. Anarchists Sacco and Vanzetti would be convicted of and executed for the crime, amid much controversy.
August 19 » The Tambov Rebellion breaks out, in response to the Bolshevik policy of Prodrazvyorstka.
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.
December 19 » King Constantine I is restored as King of the Hellenes after the death of his son Alexander of Greece and a plebiscite.
When copying data from this family tree, please include a reference to the origin: Elly Gelderman, "Family tree Gelderman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-gelderman/I4491.php : accessed January 22, 2026), "Hendrika Wilhelmina de Weerd (1896-????)".
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