Act of Union to unite the Kingdom of Great Britain and Kingdom of Ireland (both ruled by him) into the United Kingdom of Great Britain and Ireland, effective on January 1, 1801. August 30 – The plot by African-American blacksmith and slave Gabriel Prosser to seize Richmond, Virginia, and guide a slave uprising, is thwarted by a massive downpour on the evening that it is set to begin; two other slaves have revealed Prosser's plans to authorities, who have prepared to follow him to the rendezvous point and arrest the conspirators, so that "neither the geographical extent of the plot nor the number of insurgents in the conspiracy was revealed"; eventually, 25 slaves, including Prosser, will be captured, tried and hanged. September 4 – Siege of Malta (1798–1800): The French garrison in Valletta surrenders to British troops, who had been called at the invitation of the Maltese. The islands of Malta and Gozo become the Malta Protectorate. September 30 – The Convention of 1800, or Treaty of Mortefontaine, is signed between France and the United States of America, ending the Quasi-War. October–December October 1 – Third Treaty of San Ildefonso: Spain returns Louisiana (New Spain) to France, in return for the Tuscany area of Italy. October 7 – French privateer Robert Surcouf leads the 150-man crew of his corvette to capture the 40-gun, 437-man British East Indiaman in the Indian Ocean. November 1 U.S. President John Adams becomes the first President of the United States to live in the Executive Mansion (later renamed the White House). Middlebury College is granted its charter by the Vermont General Assembly. November 17 – The United States Congress holds its first Washington, D.C., session. November 22 – War of the Second Coalition: Hostilites resume. December 3 War of the Second Coalition: Battle of Hohenlinden – The French army defeats Habsburg and Bavarian troops. The 1800 United States presidential election: The Electoral College casts votes for president and Vice President that results in a tie between Thomas Jefferson and Aaron Burr, requiring a contingent election which will select Jefferson as president. December 24 The Plot of the rue Saint-Nicaise fails to kill Napoleon Bonaparte. Pierre Coudrin and Henriette Aymer de la Chevalerie found the Congregation of the Sacred Hearts of Jesus and Mary in Paris. December 25 – the Armistice of Steyr is signed between French and Imperial forces in Germany Births January–June January 1