January 17 » El Yunque National Forest in Puerto Rico becomes part of the United States National Forest System as the Luquillo Forest Reserve.
February 14 » The United States Department of Commerce and Labor is established (later split into the Department of Commerce and the Department of Labor).
June 11 » A group of Serbian officers stormed the royal palace and assassinated King Alexander Obrenović and his wife, Queen Draga.
August 2 » The Ilinden–Preobrazhenie Uprising against the Ottoman Empire begins.
August 3 » Macedonian rebels in Kruševo proclaim the Kruševo Republic, which exists for only ten days before Ottoman Turks lay waste to the town.
November 3 » With the encouragement of the United States, Panama separates from Colombia.
Day of death April 27, 1975
The temperature on April 27, 1975 was between 7.7 °C and 14.3 °C and averaged 10.0 °C. There was 0.5 mm of rain during 1.6 hours. There was 0.3 hours of sunshine (2%). The almost completely overcast was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
March 26 » The Biological Weapons Convention comes into force.
April 30 » Fall of Saigon: Communist forces gain control of Saigon. The Vietnam War formally ends with the unconditional surrender of South Vietnamese president Dương Văn Minh.
June 24 » Eastern Air Lines Flight 66 encounters severe wind shear and crashes on final approach to New York's JFK Airport killing 113 of the 124 passengers on board, making it the deadliest U.S. plane crash at the time. This accident led to decades of research into downburst and microburst phenomena and their effects on aircraft.
July 5 » Cape Verde gains its independence from Portugal.
September 5 » Sacramento, California: Lynette Fromme attempts to assassinate U.S. President Gerald Ford.
September 14 » The first American saint, Elizabeth Ann Seton, is canonized by Pope Paul VI.
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/I137665.php : accessed December 29, 2025), "Willem Sytsma (1903-1975)".
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