January 16 » The United States Senate accepts the Anglo-German treaty of 1899 in which the United Kingdom renounces its claims to the Samoan islands.
February 14 » British forces begin the Battle of the Tugela Heights in an effort to lift the Siege of Ladysmith.
March 18 » AFC Ajax Amsterdam, The Netherlands's biggest and most successful football club, was founded.
April 2 » The United States Congress passes the Foraker Act, giving Puerto Rico limited self-rule.
July 19 » The first line of the Paris Métro opens for operation.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of marriage September 15, 1920
The temperature on September 15, 1920 was between 7.0 °C and 15.2 °C and averaged 12.9 °C. There was 2.6 mm of rain. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-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.
When copying data from this family tree, please include a reference to the origin: Gerard Mutter, "Family tree De Duffelt", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-de-duffelt/I67006.php : accessed January 29, 2026), "Johannes Feritas Antonius "1900 " Helbers (1900-)".
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