February 20 » The Postal Service Act, establishing the United States Post Office Department, is signed by United States President George Washington.
May 17 » The New York Stock Exchange is formed under the Buttonwood Agreement.
May 21 » A lava dome collapses on Mount Unzen, near the city of Shimbara on the Japanese island of Kyūshū, creating a deadly tsunami that kills nearly 15,000 people.
June 4 » Captain George Vancouver claims Puget Sound for the Kingdom of Great Britain.
August 13 » King Louis XVI of France is formally arrested by the National Tribunal, and declared an enemy of the people.
September 2 » During what became known as the September Massacres of the French Revolution, rampaging mobs slaughter three Roman Catholic bishops, more than two hundred priests, and prisoners believed to be royalist sympathizers.
When copying data from this family tree, please include a reference to the origin: Tjitze Koster, "Family tree Koster Twijslerheide e.o.", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-koster/I5232.php : accessed January 7, 2026), "Paulus Gerhardus van der Ploeg".
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