1820 events in history

Jan 28 A Russian expedition led by Fabian Gottlieb von Bellingshausen and Mikhail Petrovich Lazarev discovers the Antarctic continent, approaching the Antarctic coast
Jan 30 Edward Bransfield sights the Trinity Peninsula and claims the discovery of Antarctica
Feb 4 The Chilean Navy under the command of Lord Cochrane completes the 2-day long Capture of Valdivia with just 300 men and 2 ships
Feb 6 The first 86 African American immigrants sponsored by the American Colonization Society depart New York to start a settlement in present-day Liberia
Feb 23 Cato Street Conspiracy: A plot to murder all the British cabinet ministers is exposed
Mar 3 The U.S. Congress passes the Missouri Compromise
Mar 6 The Missouri Compromise is signed into law by President James Monroe. The compromise allows Missouri to enter the Union as a slave state, brings Maine into the Union as a free state, and makes the rest of the northern part of the Louisiana Purchase territory slavery-free
Mar 15 Maine becomes the 23rd U.S. state
Apr 8 The Venus de Milo is discovered on the Aegean island of Melos
Apr 12 Alexander Ypsilantis is declared leader of Filiki Eteria, a secret organization to overthrow Ottoman rule over Greece
May 11 HMS Beagle, the ship that will take Charles Darwin on his scientific voyage, is launched
Aug 24 Constitutionalist insurrection at Oporto, Portugal
Sep 15 Constitutionalist revolution in Lisbon, Portugal
Oct 9 Guayaquil declares independence from Spain
Nov 17 Captain Nathaniel Palmer becomes the first American to see Antarctica. (The Palmer Peninsula is later named after him.)
Nov 20 An 80-ton sperm whale attacks the Essex (a whaling ship from Nantucket, Massachusetts) 2,000 miles from the western coast of South America. (Herman Melville's 1851 novel Moby-Dick is in part inspired by this story.)