April 18 » Three-Fifths Compromise: the first instance of black slaves in the United States of America being counted as three fifths of persons (for the purpose of taxation), in a resolution of the Congress of the Confederation. This was later adopted in the 1787 Constitution.
July 24 » The Kingdom of Georgia and the Russian Empire sign the Treaty of Georgievsk.
July 25 » American Revolutionary War: The war's last action, the Siege of Cuddalore, is ended by a preliminary peace agreement.
August 4 » Mount Asama erupts in Japan, killing about 1,400 people. The eruption causes a famine, which results in an additional 20,000 deaths.
October 15 » The Montgolfier brothers' hot air balloon makes the first human ascent, piloted by Jean-François Pilâtre de Rozier.
November 21 » In Paris, Jean-François Pilâtre de Rozier and François Laurent d'Arlandes, make the first untethered hot air balloon flight.
Day of death March 20, 1863
The temperature on March 20, 1863 was about 5.9 °C. There was 2 mm of rain. The air pressure was 1 kgf/m2 and came mainly from the west-southwest. The airpressure was 75 cm mercury. The atmospheric humidity was 92%. Source: KNMI
In The Netherlands , there was from February 1, 1862 to February 10, 1866 the cabinet Thorbecke II, with Mr. J.R. Thorbecke (liberaal) as prime minister.
January 26 » American Civil War: General Ambrose Burnside is relieved of command of the Army of the Potomac after the disastrous Fredericksburg campaign. He is replaced by Joseph Hooker.
March 19 » The SSGeorgiana, said to have been the most powerful Confederate cruiser, is destroyed on her maiden voyage with a cargo of munitions, medicines, and merchandise then valued at over $1,000,000.
March 30 » Danish prince Wilhelm Georg is chosen as King George of Greece.
May 21 » American Civil War: The Union Army succeeds in closing off the last escape route from Port Hudson, Louisiana, in preparation for the coming siege.
July 4 » American Civil War: The Army of Northern Virginia withdraws from the battlefield after losing the Battle of Gettysburg, signalling an end to the Confederate invasion of U.S. territory.
July 9 » American Civil War: The Siege of Port Hudson ends, giving the Union complete control of the Mississippi River.
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