– American pioneers establish the town of Marietta (in modern-day Ohio), the first permanent American settlement outside the original Thirteen Colonies. April 13 – America's first recorded riot, the 'Doctors' Mob', begins. Residents of Manhattan are angry about grave robbers stealing bodies for doctors to dissect. The rioting is suppressed on April 15. April 28 – Maryland ratifies the United States Constitution, and becomes the seventh U.S. state. May 10 – The Royal Dramatic Theatre (Kungliga Dramatiska Teatern), Sweden's national drama company, is founded. May 15 – The Australian frontier wars begin. May 23 – South Carolina ratifies the United States Constitution, and becomes the eighth U.S. state. June 7 – France: Day of the Tiles, which some consider the beginning of the French Revolution. June 9 – The African Association, an exploration group dedicated to plotting the Niger River and finding Timbuktu, is founded in England. June 17 – English captains Thomas Gilbert and John Marshall, returning from Botany Bay, become the first Europeans to encounter the Gilbert Islands in the Pacific Ocean. They also chart islands in "Lord Mulgrove's range", later known as the Marshall Islands. June 21 – New Hampshire ratifies the United States Constitution, and becomes the ninth U.S. state, enabling the Constitution to go into effect. (The latter happens on March 4, 1789, when the first Congress elected under the new Constitution assembles.) June 25 – The Virginia Ratifying Convention ratifies the United States Constitution, and becomes the tenth U.S. state under the new government. June 26 – Wolfgang Amadeus Mozart, in Vienna, completes his antepenultimate symphony, now called the Symphony No. 39 in E-flat. July–September July 13 – A hailstorm sweeps across France and the Dutch Republic, with hailstones 'as big as quart bottles' that take 'three days to melt'; immense damage is done. July 24 – Governor General Lord Dorchester, by proclamation issued from the Chateau St. Louis in Quebec City, divides the British Province of Quebec into five Districts, namely: Gaspé, Nassau, Lunenburg, Mecklenburg, and Hesse. July 26 – New York ratifies the United States Constitution, and becomes the eleventh U.S. state. July 28 – Wolfgang Amadeus Mozart, in Vienna, completes his penultimate symphony, now called the Symphony No. 40 in G Minor. August 8 – King Louis XVI of France agrees to convene the Estates-General meeting in May 1789, the first time since 1614. August 10 – Wolfgang Amadeus Mozart, in