1791 events in history

Jan 2 Big Bottom massacre in the Ohio Country, marking the beginning of the Northwest Indian War
Jan 10 The Siege of Dunlap's Station begins near Cincinnati during the Northwest Indian War
Jan 25 The British Parliament passes the Constitutional Act of 1791 and splits the old Province of Quebec into Upper and Lower Canada
Mar 2 Long-distance communication speeds up with the unveiling of a semaphore machine in Paris
Mar 4 Vermont is admitted to the United States as the fourteenth state
Mar 4 The Constitutional Act of 1791 is introduced by the British House of Commons in London which envisages the separation of Canada into Lower Canada (Quebec) and Upper Canada (Ontario)
May 3 The Constitution of May 3 (the first modern constitution in Europe) is proclaimed by the Sejm of Polish–Lithuanian Commonwealth
May 15 French Revolution: Maximilien Robespierre proposes the Self-denying Ordinance
Jun 21 King Louis XVI of France and his immediate family begin the Flight to Varennes during the French Revolution
Jul 14 The Priestley Riots drive Joseph Priestley, a supporter of the French Revolution, out of Birmingham, England
Jul 17 Members of the French National Guard under the command of General Lafayette open fire on a crowd of radical Jacobins at the Champ de Mars, Paris, during the French Revolution, killing as many as 50 people
Aug 4 The Treaty of Sistova is signed, ending the Ottoman–Habsburg wars
Aug 7 American troops destroy the Miami town of Kenapacomaqua near the site of present-day Logansport, Indiana in the Northwest Indian War
Aug 22 Beginning of the Haitian Slave Revolution in Saint-Domingue
Aug 26 John Fitch is granted a United States patent for the steamboat
Aug 30 HMS Pandora sinks after having run aground on a reef the previous day
Sep 9 Washington, D.C., the capital of the United States, is named after President George Washington
Sep 13 King Louis XVI of France accepts the new constitution
Sep 14 The Papal States lose Avignon to the French Empire
Sep 28 France becomes the first country to emancipate its Jewish population
Sep 30 The National Constituent Assembly in Paris is dissolved; Parisians hail Maximilien Robespierre and Jérôme Pétion as "incorruptible patriots"
Sep 30 The first performance of The Magic Flute, the last opera by Mozart to make its debut, took place at Freihaus-Theater auf der Wieden in Vienna, Austria
Oct 1 First session of the French Legislative Assembly
Nov 4 The Western Confederacy of American Indians wins a major victory over the United States in the Battle of the Wabash
Nov 9 Foundation of the Dublin Society of United Irishmen
Nov 15 The first U.S. Catholic college, Georgetown University, opens its doors
Dec 4 The first edition of The Observer, the world's first Sunday newspaper, is published
Dec 15 The United States Bill of Rights becomes law when ratified by the Virginia General Assembly