January 10 » The first great Texas oil gusher is discovered at Spindletop in Beaumont, Texas.
February 2 » Funeral of Queen Victoria.
March 2 » The U.S. Congress passes the Platt Amendment limiting the autonomy of Cuba, as a condition of the withdrawal of American troops.
May 9 » Australia opens its first national parliament in Melbourne.
November 18 » Britain and the United States sign the Hay–Pauncefote Treaty, which nullifies the Clayton–Bulwer Treaty and withdraws British objections to an American-controlled canal in Panama.
December 3 » In a State of the Union message, U.S. President Theodore Roosevelt delivers a 20,000-word speech to the House of Representatives asking Congress to curb the power of trusts "within reasonable limits".
Day of death April 17, 1971
The temperature on April 17, 1971 was between 3.2 °C and 8.9 °C and averaged 5.6 °C. There was 1.6 mm of rain during 0.9 hours. There was 7.4 hours of sunshine (53%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-northwest. 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 21 » The Convention on Psychotropic Substances is signed at Vienna.
May 1 » Amtrak (the National Railroad Passenger Corporation) takes over operation of U.S. passenger rail service.
May 19 » Mars probe program: Mars 2 is launched by the Soviet Union.
September 13 » Chairman Mao Zedong's second in command and successor Marshal Lin Biao flees the People's Republic of China after the failure of an alleged coup. His plane crashes in Mongolia, killing all aboard.
December 2 » Abu Dhabi, Ajman, Fujairah, Sharjah, Dubai, and Umm al-Quwain form the United Arab Emirates.
When copying data from this family tree, please include a reference to the origin: N.P.P. Sies, "Family tree Sies", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-sies/I1069.php : accessed February 2, 2026), "Pieter Johan Coomans (1901-1971)".
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