February 27 » King George I of Greece survives an assassination attempt.
April 20 » U.S. President William McKinley signed a joint resolution to Congress for declaration of war against Spain, beginning the Spanish–American War.
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.
August 28 » Caleb Bradham's beverage "Brad's Drink" is renamed "Pepsi-Cola".
October 14 » The steam ship SSMohegan sinks near the Lizard peninsula, Cornwall, killing 106.
December 26 » Marie and Pierre Curie announce the isolation of radium.
Day of marriage May 14, 1921
The temperature on May 14, 1921 was between 8.5 °C and 25.0 °C and averaged 16.3 °C. There was 10.5 hours of sunshine (67%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west-northwest. 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.
February 21 » Rezā Shāh takes control of Tehran during a successful coup.
March 17 » The Second Polish Republic adopts the March Constitution.
June 30 » U.S. President Warren G. Harding appoints former President William Howard Taft as Chief Justice of the United States.
July 11 » Former president of the United States William Howard Taft is sworn in as 10th chief justice of the U.S. Supreme Court, becoming the only person ever to hold both offices.
September 21 » A storage silo in Oppau, Germany, explodes, killing 500–600 people.
October 26 » The Chicago Theatre opens.
Day of death April 11, 1952
The temperature on April 11, 1952 was between 9.1 °C and 21.5 °C and averaged 14.7 °C. There was 10.6 hours of sunshine (78%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
February 21 » The British government, under Winston Churchill, abolishes identity cards in the UK to "set the people free".
July 3 » The SSUnited States sets sail on her maiden voyage to Southampton. During the voyage, the ship takes the Blue Riband away from the RMSQueen Mary.
July 7 » The ocean liner SSUnited States passes Bishop Rock on her maiden voyage, breaking the transatlantic speed record to become the fastest passenger ship in the world.
July 19 » Opening of the Summer Olympics in Helsinki, Finland.
August 12 » The Night of the Murdered Poets: Thirteen prominent Jewish intellectuals are murdered in Moscow, Russia, Soviet Union.
September 19 » The United States bars Charlie Chaplin from re-entering the country after a trip to England.
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/I2233.php : accessed December 25, 2025), "Cornelis Koopmans (1898-1952)".
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