January 13 » Émile Zola's J'accuse…! exposes the Dreyfus affair.
February 23 » Émile Zola is imprisoned in France after writing J'Accuse…!, a letter accusing the French government of antisemitism and wrongfully imprisoning Captain Alfred Dreyfus.
March 16 » In Melbourne the representatives of five colonies adopted a constitution, which would become the basis of the Commonwealth of Australia.
June 22 » Spanish–American War: In a chaotic operation, 6,000 men of the U.S. Fifth Army Corps begins landing at Daiquirí, Cuba, about 16 miles (26km) east of Santiago de Cuba. Lt. Gen. Arsenio Linares y Pombo of the Spanish Army outnumbers them two-to-one, but does not oppose the landings.
July 7 » US President William McKinley signs the Newlands Resolution annexing Hawaii as a territory of the United States.
September 21 » Empress Dowager Cixi seizes power and ends the Hundred Days' Reform in China.
Day of marriage August 20, 1931
The temperature on August 20, 1931 was between 12.5 °C and 20.1 °C and averaged 15.7 °C. There was 10.1 hours of sunshine (70%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the south-southwest. Source: KNMI
In The Netherlands , there was from August 10, 1929 to May 26, 1933 the cabinet Ruys de Beerenbrouck III, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
February 13 » The British Raj completes its transfer from Calcutta to New Delhi.
March 11 » Ready for Labour and Defence of the USSR, abbreviated as GTO, is introduced in the Soviet Union.
May 1 » The Empire State Building is dedicated in New York City.
September 18 » The Mukden Incident gives Japan a pretext to invade and occupy Manchuria.
December 5 » Cathedral of Christ the Saviour in Moscow was destroyed on orders from Joseph Stalin.
December 9 » The Constituent Cortes approves a constitution which establishes the Second Spanish Republic.
Day of death January 12, 1966
The temperature on January 12, 1966 was between -5.0 °C and -0.7 °C and averaged -2.4 °C. There was 0.2 hours of sunshine (2%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
January 13 » Robert C. Weaver becomes the first African American Cabinet member when he is appointed United States Secretary of Housing and Urban Development.
February 14 » Australian currency is decimalized.
October 1 » West Coast Airlines Flight 956 crashes with no survivors in Oregon. This accident marks the first loss of a DC-9.
November 24 » Bulgarian TABSO Flight 101 crashes near Bratislava, Czechoslovakia, killing all 82 people on board.
December 26 » The first Kwanzaa is celebrated by Maulana Karenga, the chair of Black Studies at California State University, Long Beach.
December 27 » The Cave of Swallows, the largest known cave shaft in the world, is discovered in Aquismón, San Luis Potosí, Mexico.
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/I79472.php : accessed September 30, 2026), "Pieter Koopmans (1898-1966)".
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