February 4 » The Philippine–American War begins with the Battle of Manila.
February 16 » Iceland's first football club, Knattspyrnufélag Reykjavíkur, is founded.
March 4 » Cyclone Mahina sweeps in north of Cooktown, Queensland, with a 12 metres (39ft) wave that reaches up to 5 kilometres (3.1mi) inland, killing over 300.
September 13 » Henry Bliss is the first person in the United States to be killed in an automobile accident.
November 29 » FC Barcelona is founded by Catalan, Spanish and Englishmen. It later develops into one of Spanish football's most iconic and strongest teams.
December 2 » Philippine–American War: The Battle of Tirad Pass, termed "The Filipino Thermopylae", is fought.
Day of death April 12, 1971
The temperature on April 12, 1971 was between 0.9 °C and 12.0 °C and averaged 6.5 °C. There was -0.1 mm of rain. There was 6.2 hours of sunshine (45%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
February 8 » South Vietnamese ground troops launch an incursion into Laos to try to cut off the Ho Chi Minh trail and stop communist infiltration.
February 15 » The decimalisation of British coinage is completed on Decimal Day.
February 21 » The Convention on Psychotropic Substances is signed at Vienna.
February 27 » Doctors in the first Dutch abortion clinic (the Mildredhuis in Arnhem) start performing artificially-induced abortions.
June 7 » The United States Supreme Court overturns the conviction of Paul Cohen for disturbing the peace, setting the precedent that vulgar writing is protected under the First Amendment to the United States Constitution.
September 11 » The Egyptian Constitution becomes official.
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/I78603.php : accessed October 20, 2026), "Herman Piersma (1899-1971)".
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