| January 9 | 1st hot-air balloon flight in the U.S. lifts off in Philadelphia |
| January 9 | Dutch Prince Willem V establishes 2 brigades Drive Artillery |
| January 9 | Jean Pierre Blanchard makes 1st balloon flight in North America |
| January 19 | French King Louis XVI sentenced to death |
| January 21 | Prussia and Russia sign partition treaty (Poland divided) |
| January 23 | 2nd partition of Poland, between Prussia and Russia |
| January 23 | Humane Society of Philadelphia (1st aid society) organized |
| February 1 | France declares war on England and Netherlands |
| February 1 | Patent granted Ralph Hodgson, New York, for oiled silk and linen |
| February 11 | Prussian troops occupy Venlo, Netherlands |
| February 12 | 1st U.S. fugitive slave law passed; requires return of escaped slaves |
| February 24 | French troops conquer Breda |
| February 25 | 1st cabinet meeting at George Washington's home |
| March 4 | French troops conquer Geertruidenberg Netherlands |
| March 4 | Washington's 2nd inauguration, shortest speech (133 words) |
| March 18 | 2nd Battle at Neerwinden: Austria army beats France |
| March 26 | Pro-royalist uprising in Vendee region of France |
| April 1 | Volcano Unsen on Japan erupts killing about 53,000 |
| April 15 | Bank of England hands out 1st 5 pound note |
| April 17 | Battle of Warsaw |
| April 22 | President Washington attends opening of Rickett's, 1st circus in U.S. |
| April 29 | Cornerstone laid for Groningen's new townhall |
| May 19 | Netherlands captures French island of St. Maarten (held until 1795) |
| May 21 | Curacao Island Council forbids criticism on House of Orange |
| May 25 | Father Stephen Theodore Badin is 1st U.S. Roman Catholic priest ordained |
| May 30 | Georges Couthon chosen member of French Committee the Salut Public |
| June 10 | 1st public zoo opens in Paris |
| June 10 | Washington replaced Philadelphia as U.S. capital |
| June 11 | 1st American stove patent is granted to Robert Haeterick |
| June 20 | Eli Whitney patents his cotton gin |
| June 24 | 1st republican constitution in France adopted |
| July 24 | France passes 1st copyright law |
| August 1 | France becomes 1st country to use the metric system |
| August 29 | Slaves in French colony of St. Domingue (Haiti) freed |
| September 5 | In the French Revolution, the "Reign of Terror" begins |
| September 18 | President Washington lays cornerstone of Capitol building |
| September 20 | British troops under major-general Williamson lands on (French) Haiti |
| September 29 | Tennis is 1st mentioned in an English sporting magazine |
| October 28 | Eli Whitney applies for a patent on cotton gin |
| October 31 | Execution of Girondins at Paris, during Reign of Terror |
| November 8 | Louvre in Paris, opens |
| November 10 | France ends forced worship of God |
| November 18 | Louvre officially opens in Paris |
| November 26 | Republican calendar replaces Gregorian calendar in France |
| December 9 | Noah Webster establishes New York's 1st daily newspaper, American Minerva |
| December 14 | 1st state road authorized, Frankfort, Kentucky to Cincinnati |