March 23 » Emilio Aguinaldo, only President of the First Philippine Republic, was captured at Palanan, Isabela by the forces of General Frederick Funston.
August 14 » The first claimed powered flight, by Gustave Whitehead in his Number 21.
August 21 » Six hundred American school teachers, Thomasites, arrived in Manila on the USAT Thomas.
September 28 » Philippine–American War: Filipino guerrillas kill more than forty American soldiers while losing 28 of their own.
November 13 » The 1901 Caister lifeboat disaster.
December 12 » Guglielmo Marconi receives the first transatlantic radio signal (the letter "S" [***] in Morse Code), at Signal Hill in St John's, Newfoundland.
Day of death April 21, 1971
The temperature on April 21, 1971 was between 3.2 °C and 17.7 °C and averaged 11.6 °C. There was 10.5 hours of sunshine (74%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east. Source: KNMI
January 1 » Cigarette advertisements are banned on American television.
January 25 » Idi Amin leads a coup deposing Milton Obote and becomes Uganda's president.
January 31 » The Winter Soldier Investigation, organized by the Vietnam Veterans Against the War to publicize war crimes and atrocities by Americans and allies in Vietnam, begins in Detroit.
April 5 » In Sri Lanka, Janatha Vimukthi Peramuna launches a revolt against the United Front government of Sirimavo Bandaranaike.
May 13 » Over 900 unarmed Bengali Hindus are murdered in the Demra massacre.
June 30 » The crew of the Soviet Soyuz 11 spacecraft are killed when their air supply escapes through a faulty valve.
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/I199575.php : accessed October 4, 2026), "Harmannus van der Klok (1901-1971)".
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