January 30 » The first Anglo-Japanese Alliance is signed in London.
April 20 » Pierre and Marie Curie refine radium chloride.
May 20 » Cuba gains independence from the United States. Tomás Estrada Palma becomes the country's first President.
May 31 » Second Boer War: The Treaty of Vereeniging ends the war and ensures British control of South Africa.
August 22 » Cadillac Motor Company is founded.
October 24 » Guatemala's Santa María Volcano begins to erupt, becoming the third-largest eruption of the 20th century.
Day of marriage September 17, 1940
The temperature on September 17, 1940 was between 13.4 °C and 19.0 °C and averaged 15.6 °C. There was 0.7 mm of rain during 0.6 hours. There was 3.1 hours of sunshine (25%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the southwest. Source: KNMI
In The Netherlands , there was from August 10, 1939 to September 3, 1940 the cabinet De Geer II, with Jonkheer mr. D.J. de Geer (CHU) as prime minister.
In The Netherlands , there was from September 3, 1940 to July 27, 1941 the cabinet Gerbrandy I, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
May 27 » World War II: In the Le Paradis massacre, 99 soldiers from a Royal Norfolk Regiment unit are shot after surrendering to German troops; two survive.
June 10 » World War II: Military resistance to the German occupation of Norway ends.
August 15 » An Italian submarine torpedoes and sinks the Greek cruiserElli at Tinos harbor during peacetime, marking the most serious Italian provocation prior to the outbreak of the Greco-Italian War in October.
September 16 » World War II: Italian troops conquer Sidi Barrani.
September 17 » World War II: Due to setbacks in the Battle of Britain and approaching autumn weather, Hitler postpones Operation Sea Lion.
October 28 » Second World War: Greece rejects Italy's ultimatum. Italy invades Greece through Albania a few hours later.
Day of death November 7, 1969
The temperature on November 7, 1969 was between -0.2 °C and 6.0 °C and averaged 2.9 °C. There was 3.1 mm of rain during 6.2 hours. The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
April 5 » Vietnam War: Massive antiwar demonstrations occur in many U.S. cities.
May 21 » Civil unrest in Rosario, Argentina, known as Rosariazo, following the death of a 15-year-old student.
July 3 » Space Race: The biggest explosion in the history of rocketry occurs when the Soviet N-1 rocket explodes and subsequently destroys its launchpad.
July 25 » Vietnam War: U.S. President Richard Nixon declares the Nixon Doctrine, stating that the United States now expects its Asian allies to take care of their own military defense. This is the start of the "Vietnamization" of the war.
September 9 » In Canada, the Official Languages Act comes into force, making French equal to English throughout the Federal government.
November 19 » Association football player Pelé scores his 1,000th goal.
When copying data from this family tree, please include a reference to the origin: Jan Potters, "Family tree Potters", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-potters/I63.php : accessed March 4, 2026), "Lucia Sep (1902-1969)".
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