February 6 » American Revolutionary War: In Paris the Treaty of Alliance and the Treaty of Amity and Commerce are signed by the United States and France signaling official recognition of the new republic.
February 6 » New York became the third state to ratify the Articles of Confederation.
February 23 » American Revolutionary War: Baron von Steuben arrives at Valley Forge, Pennsylvania to help to train the Continental Army.
March 17 » American Revolution: George Washington grants the Continental Army a holiday "as an act of solidarity with the Irish in their fight for independence".
May 19 » New England's Dark Day, an unusual darkening of the day sky, was observed over the New England states and parts of Canada.
September 11 » American Revolutionary War: Sugarloaf Massacre: A small detachment of militia from Northampton County are attacked by Native Americans and Loyalists near Little Nescopeck Creek.
October 10 » The Great Hurricane of 1780 kills 20,000–30,000 in the Caribbean.
October 16 » American Revolutionary War: The British-led Royalton raid is the last Native American raid on New England.
December 14 » Founding Father Alexander Hamilton marries Elizabeth Schuyler Hamilton at the Schuyler Mansion in Albany, New York
When copying data from this family tree, please include a reference to the origin: J Eijsermans, "Eijsermans family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eijsermans/I121658.php : accessed March 11, 2026), "Petronella van de Sande (-1780)".
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