February 9 » The Davis Cup competition is established.
February 23 » Second Boer War: During the Battle of the Tugela Heights, the first British attempt to take Hart's Hill fails.
April 14 » The Exposition Universelle begins.
June 18 » Empress Dowager Cixi of China orders all foreigners killed, including foreign diplomats and their families.
September 8 » Galveston hurricane: A powerful hurricane hits Galveston, Texas killing about 8,000 people.
October 19 » Max Planck discovers Planck's law of black-body radiation.
Day of marriage September 17, 1920
The temperature on September 17, 1920 was between 9.9 °C and 17.6 °C and averaged 13.5 °C. There was 1.7 mm of rain. There was 5.7 hours of sunshine (45%). The average windspeed was 4 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.
January 19 » The American Civil Liberties Union (ACLU) is founded.
May 7 » Kiev Offensive: Polish troops led by Józef Piłsudski and Edward Rydz-Śmigły and assisted by a symbolic Ukrainian force capture Kiev only to be driven out by the Red Army counter-offensive a month later.
May 16 » In Rome, Pope Benedict XV canonizes Joan of Arc.
August 13 » Polish–Soviet War: The Battle of Warsaw begins and will last till August 25. The Red Army is defeated.
August 18 » The Nineteenth Amendment to the United States Constitution is ratified, guaranteeing women's suffrage.
October 14 » Finland and Soviet Russia sign the Treaty of Tartu, exchanging some territories.
Day of death December 13, 1960
The temperature on December 13, 1960 was between -0.4 °C and 2.4 °C and averaged 1.1 °C. The almost completely overcast was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
January 30 » The African National Party is founded in Chad, through the merger of traditionalist parties.
February 3 » British Prime Minister Harold Macmillan speaks of "a wind of change", signalling that his Government was likely to support decolonisation.
April 4 » France agrees to grant independence to the Mali Federation, a union of Senegal and French Sudan.
April 19 » Students in South Korea hold a nationwide pro-democracy protest against president Syngman Rhee, eventually forcing him to resign.
September 14 » The Organization of Petroleum Exporting Countries (OPEC) is founded.
November 9 » Robert McNamara is named president of Ford Motor Company, the first non-Ford to serve in that post. A month later, he resigned to join the administration of newly elected John F. Kennedy.
When copying data from this family tree, please include a reference to the origin: Wicher Dam, "Dambomen, negen verschillende stambomen DAM", database, Genealogy Online (https://www.genealogieonline.nl/dambomen/I18941.php : accessed March 1, 2026), "Johannes Franciscus "Johanna" de Leeuw (1900-1960)".
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