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1789 ( MDCCLXXXIX) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1789th year of the Common Era (CE) and (AD) designations, the 789th year of the Anno Domini 2nd millennium, the 89th year of the 18th century, and the 10th and last year of the 1780s decade. As of the start of 1789, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.
January – Emmanuel Joseph Sieyès publishes the pamphlet ( What Is the Third Estate? Qu'est-ce que le tiers-état?), influential on the French Revolution.
January 7 – The United States presidential election, 1788-89 and House of Representatives elections are held.
January 9 – Treaty of Fort Harmar: The terms of the Treaty of Fort Stanwix (1784) and the Treaty of Fort McIntosh, between the United States Government and certain native American tribes, are reaffirmed, with some minor changes.
January 21 – The first American novel, , is printed in The Power of Sympathy or the Triumph of Nature Founded in Truth Boston, Massachusetts. The anonymous author is William Hill Brown. January 23 – Georgetown University is founded in Georgetown, Maryland (today part of Washington, D.C.), as the first Roman Catholic college in the United States.
February – King Gustav III of Sweden enforces the Union and Security Act, delivering the coup de grace to Sweden's 70-year-old parliamentarian system, in favor of absolute monarchy.
February 4 – George Washington is unanimously elected the first President of the United States, by the United States Electoral College.
March – The first version of a graphic description of a slave ship (the ) is issued on behalf of the English Brookes Society for Effecting the Abolition of the Slave Trade.  
March 4 – At Federal Hall in New York City, the 1st United States Congress meets, and declares the new United States Constitution to be in effect. The bicameral United States Congress replaces the unicameral Congress of the Confederation, as the legislature of the federal government of the United States. March 11 – The Venetian arsenal on the island of Corfu, containing 72,000 pounds (33,000 kg) of gunpowder and 600 bombshells, explodes during a fire, killing 180 bystanders and knocking down a seawall. 
April 1 – At Federal Hall, the United States House of Representatives attains its first quorum, and elects congressman Frederick Muhlenberg as the first Speaker of the House.
April 6 – At Federal Hall, the United States Senate attains its first quorum, and elects John Langdon of Pennsylvania as its first President pro tempore. Later that day, the Senate and the House of Representatives meet in joint session for the first time, and the electoral votes of the first U.S. Presidential election are counted. General George Washington is certified as President-elect, and John Adams is certified as Vice-President elect.
April 7 – Selim III (1789-1807) succeeds Abdul Hamid I (1773-1789), as Ottoman Sultan.
April 21 – John Adams takes office as the first Vice President of the United States, and begins presiding over the United States Senate.
April 28 – Mutiny on the : Bounty Fletcher Christian leads the mutiny on the British Royal Navy ship HMS against Captain Bounty William Bligh, in the Pacific Ocean.
April 30 – George Washington is inaugurated at Federal Hall in New York City, beginning his term as the first President of the United States.
May 5 – In France, the Estates-General convenes for the first time in 175 years. June – The is the first attempt at Brazilian independence from Portugal. Inconfidência Mineira
July – An estimated 150,000 of Paris's 600,000 people are without work.
July 1 – The comic ballet , choreographed by La fille mal gardée Jean Dauberval, is first presented under the title Le ballet de la paille, at the Grand Théâtre de Bordeaux, at Bordeaux, France.
July 4 – The U.S. Congress passes its first bill, setting out tariffs. 
July – Storofsen flood in Norway.
July 10 – Alexander Mackenzie reaches the Mackenzie River Delta.
July 11 – Louis XVI of France dismisses popular Chief Minister Jacques Necker.
July 12 – An angry Parisian crowd, inflamed by a speech from journalist Camille Desmoulins, demonstrates against the King's decision to dismiss Minister Necker.
July 13 – The people begin to seize arms for the defense of Paris. July 14
July 27 – The first agency of the Federal government of the United States under the new Constitution, the Department of Foreign Affairs (from  September 15 renamed the Department of State), is established.
August 4 – In France, members of the Constituent Assembly take an oath to end feudalism, and abandon their privileges.
August 7 – The United States Department of War is established. 
August 18 – The Liège Revolution breaks out in the Prince-Bishopric of Liège.
August 21 – A proposal for a Bill of Rights is adopted by the United States House of Representatives.  
August 26 – The is proclaimed in France, by the Constituent Assembly. Declaration of the Rights of Man and of the Citizen
August 28 – William Herschel discovers Enceladus, one of Saturn's moons.
September 2 – The United States Department of the Treasury is founded. 
September 11 – Alexander Hamilton is appointed as the first United States Secretary of the Treasury.
September 22 –
September 24 – The Judiciary Act of 1789 establishes the federal judiciary, and the United States Marshals Service. 
September 25 – The United States Congress proposes a set of 12 amendments to the U.S. constitution, for ratification by the states. Ratification for 10 of these proposals is completed on December 5, 1791, creating the  United States Bill of Rights.
September 26 – Thomas Jefferson, U.S. Minister to France, is appointed as the first U.S. Secretary of State.  September 29 – The U.S. Department of War establishes the nation's first regular army, with a strength of several hundred men.
Joseph II, Holy Roman Emperor, decrees that all peasant labor obligations be converted into cash payments. The
(Elementary Treatise of Chemistry), an influential chemistry textbook by Traité Élémentaire de Chimie Antoine Lavoisier, is published; translated into English in 1790, it comes to be considered the first modern chemical textbook. German chemist
Martin Heinrich Klaproth discovers the element uranium, while studying the mineral pitchblende. Properties of
Évian water first discovered. The
Bengal Presidency first establishes a penal colony, in the Andaman Islands.
Famine in Ethiopia.
Thomas Jefferson returns from Europe, bringing the first machine to the United States. macaroni Influenced by Dr.
Benjamin Rush's argument against the excessive use of alcohol, about 200 farmers in a Connecticut community form a temperance movement in the United States.
Fort Washington (Cincinnati, Ohio) is built to protect early U.S. settlements in the Northwest Territory. Former slave Olaudah Equiano's autobiography , one of the earliest published works by a black writer, is published in London. The Interesting Narrative of the Life of Olaudah Equiano 
January 3 – Carl Gustav Carus, German physiologist (d. 1869)
January 4 – Benjamin Lundy, American abolitionist (d. 1839)
January 12 – Ettore Perrone di San Martino, prime minister of Sardinia (d. 1849)
January 21 – William Machin Stairs, Canadian businessman, statesman (d. 1865)
February 22 – René Edward De Russy, Brigadier General of the United States Army, Superintendent of the United States Military Academy, and military engineer (d. 1865)
March 16 – Georg Ohm, German physicist (d. 1854)
April 15 – Diego Noboa, 4th President of Ecuador (d. 1870)
April 22 – Manuel Gómez Pedraza, 6th President of Mexico (d. 1851)
May 1 – George Fife Angas, founder of South Australia (d. 1879)
May 24 – Cathinka Buchwieser, German operatic singer and actress
June 8 – Queen Sunwon, Korean regent (d. 1857)
June 30 – Horace Vernet, French painter (d. 1863)
July 19 – John Martin, English painter (d. 1854)
August 6 – Friedrich List, German journalist (d. 1846)
August 21 – Augustin-Louis Cauchy, French mathematician (d. 1857)
August 28 – Stéphanie de Beauharnais, Grand Duchess of Baden (d. 1860)
September 3 – Hannah Flagg Gould, American poet (d. 1865)
September 4 – Charles Gaudichaud-Beaupré, French botanist (d. 1854)
September 15 – James Fenimore Cooper, American writer (d. 1851)
September 28 – Richard Bright (physician), English physician; Father of Nephrology (d. 1858)
October 8 – William John Swainson, English naturalist, artist (d. 1855)
November 5 – William Bland, Australian politician (d. 1868)
December 22 – Levi Woodbury, American politician, Associate Justice of the Supreme Court of the United States (d. 1851)
December 25 – Elizabeth Jesser Reid, English social reformer, founder of Bedford College (d. 1866)
December 28 – Catharine Sedgwick, American writer (d. 1867) date unknown – Mohammad Ibrahim Zauq, Urdu poet (d. 1854)
January 1 – Fletcher Norton, 1st Baron Grantley, English politician (b. 1716)
January 8 – Jack Broughton, English boxer (b. 1703)
January 10 – James Mitchell Varnum, American brigadier general of the Revolutionary War, Continental Congressman for Rhode Island (b. 1748)
January 13 – Joseph Spencer, American major general of the Revolutionary War, Continental Congressman for Connecticut (b. 1714)
January 23 – Frances Brooke, English writer (b. 1724)
January 25 – James Randolph Reid, American Continental Congressman for Connecticut (b. 1750)
February 12 – Ethan Allen, American major general of the Revolutionary War, Vermont statesman (b. 1738)
February 19 – Nicholas Van Dyke, American lawyer and President of Delaware (b. 1738)
March 23 – Thomas Osborne, 4th Duke of Leeds, British politician (b. 1713) April 5 – William Vane, 2nd Viscount Vane of Ireland (b. 1714)
April 13 – Joseph Spencer, American colonel of the Revolutionary War, Continental Congressman for New Hampshire (b. 1739)
April 26 – Count Petr Ivanovich Panin, Russian soldier (b. 1721)
May 5 – Giuseppe Marc'Antonio Baretti, Italian literary critic (b. 1719)
May 15 – Jean-Baptiste Marie Pierre, French painter (b. 1714)
May 25 – Anders Dahl, Swedish botanist (b. 1751)
June 4 – Louis Joseph, Dauphin of France, son of Louis XVI of France (tuberculosis) (b. 1781)
June 6 – Charles Thomas, Prince of Löwenstein-Wertheim-Rochefort, German nobleman, head of the House of Löwenstein-Wertheim-Rochefort (b. 1714)
June 15 – Marcus Fredrik Bang, Norwegian bishop (b. 1711)
July 13 – Victor de Riqueti, marquis de Mirabeau, French economist (b. 1715)
July 14 – Jacques de Flesselles, French provost (assassinated) (b. 1721)
July 15 – Jacques Duphly, French composer (b. 1715)
July 16 – Domenico Caracciolo, Italian politician (b. 1715)
July 22 – Joseph Foullon de Doué, French politician (executed) (b. 1715)
July 30 – Giovanna Bonanno, Italian poisoner, alleged witch (b. c. 1713)
August 22 – Johann Heinrich Tischbein, German artist (b. 1722) September 4 – Paul Spooner, American lieutenant governor of Vermont (1782-1787) (b. 1746)
October 9 – James Hamilton, 8th Earl of Abercorn (b. 1712)
October 27 – John Cook, American farmer, President of Delaware (b. 1730)
November 10 – Richard Caswell, American major general of the Revolutionary War, Continental Congressman and Governor of North Carolina (1776-80, 1785-87) (b. 1729)
November 17 – Samuel Holden Parsons, American major general of the Revolutionary War, member of the Connecticut House of Representatives (b. 1737)
November 26 – John Elwes (politician), British politician (b. 1714)
December 3 – Claude Joseph Vernet, French painter (b. 1714)
December 10 – William Pierce, American member of the Georgia House of Representatives, Continental Congressman for Georgia (c. 1753)
December 12 – John Ponsonby, Irish politician (b. 1713)
December 23 – Charles-Michel de l'Épée, French philanthropist, developer of signed French (b. 1712) date unknown – Mary Evans, Welsh religious leader (b. 1735)
"219 years ago - . Description of a Slave Ship" Rare Book Collections @ Princeton. Princeton University Library. 2008. Archived from the original on February 4, 2014 . Retrieved 2013.
"The . Brookes - visualising the transatlantic slave trade" 1807 Commemorated. University of York Institute for the Public Understanding of the Past. 2007 . Retrieved 2013.
^ "Fires, Great", in
The Insurance Cyclopeadia: Being an Historical Treasury of Events and Circumstances Connected with the Origin and Progress of Insurance, Cornelius Walford, ed. (C. and E. Layton, 1876) p61
^ a b c d e f g
Harper's Encyclopaedia of United States History from 458 A. D. to 1909, ed. by Benson John Lossing and, Woodrow Wilson (Harper & Brothers, 1910) p168-169
"The establishment of the Department of War". clerk.house.gov. Archived from the original on March 7, 2011.
Adamson, Barry (2008). . Pelican Publishing. p. 93. Freedom of Religion, the First Amendment, and the Supreme Court: How the Court Flunked History
, August 21, 1789, p. 85 Journal of the House of Representatives of the United States, 1789-1793
"The First Supreme Court". History.com. Archived from the original on May 1, 2009 . Retrieved 2008.
"BBC History British History Timeline". Archived from the original on September 9, 2007 . Retrieved 2007.