He returned to politics to oppose the pro-slavery Kansas – Nebraska Act ( 1854 ); this law repealed the slavery-restricting Missouri Compromise ( 1820 ).

Percy Bysshe Shelley composed a " Hymn of Apollo " ( 1820 ), and the god's instruction of the Muses formed the subject of Igor Stravinsky's Apollon musagète ( 1927 – 1928 ).

Causes include controversy over admitting Missouri as a slave state in 1820, the acquisition of Texas as a slave state in 1845 and the status of slavery in western territories won as a result of the Mexican – American War and the resulting Compromise of 1850.

* 1820 – Nadar, French photographer, caricaturist, journalist, novelist and balloonist ( d. 1910 )

* 1820 – Alexander Ypsilantis is declared leader of Filiki Eteria, a secret organization to overthrow Ottoman rule over Greece.

* 1820 – George Grove, English historian ( d. 1900 )

* 1820 – John Tyndall, British physicist ( d. 1893 )

* 1890 – David Wilber, American politician ( b. 1820 )

* 1751 – Wilhelmina of Prussia, Princess of Orange ( d. 1820 )

* 1820 – Andrew Rainsford Wetmore, Canadian politician ( d. 1892 )

* 1820 – Constitutionalist insurrection at Oporto, Portugal.

* Alfonso Sanz y Martínez de Arizala ( 28 January 1880, Madrid – 1970 ), married in 1922 to María de Guadalupe de Limantour y Mariscal ( d. 1977, Marbella ), daughter of Julio de Limantour y Marquet ( 17 June 1863, Mexico City – 11 October 1909, Mexico City ) and wife Elena Mariscal y ..., paternal granddaughter of French Joseph Yves de Limantour y Rence de la Pagame ( 1812, Ploemeur – 1885, Mexico City ) and wife Adèle Marquet y Cabannes ( 1820, Bordeaux –?

* 1771 – Karl Philipp Fürst zu Schwarzenberg, Austrian field marshal ( d. 1820 )

* 1820 – Alexander Cartwright, American inventor of Baseball ( d. 1892 )

Anne Brontë (; 17 January 1820 – 28 May 1849 ) was a British novelist and poet, the youngest member of the Brontë literary family.

Four more children followed: Charlotte, ( 1816 – 1855 ), Patrick Branwell ( 1817 – 1848 ), Emily, ( 1818 – 1848 ) and Anne ( 1820 – 1849 ).

* 1899 – Joseph Wolf, German artist ( b. 1820 )

* Daniel Boone ( November 2, 1734 October 22 – September 26, 1820 ) was an American pioneer, explorer, and frontiersman whose frontier exploits made him one of the first folk heroes of the United States.

* 1820 – The Venus de Milo is discovered on the Aegean island of Melos.

The Crittenden Compromise would have extended the Missouri Compromise line of 1820, dividing the territories into slave and free, contrary to the Republican Party's free-soil platform.

The turning point came with the debate on the Missouri Compromise in 1820 when he broke with his friend John C. Calhoun, who became the most outspoken national leader in favor of slavery.

As nationalism surged, partisan fury subsided and the " Era of Good Feelings " ensued until the Panic of 1819 struck and dispute over the admission of Missouri embroiled the country in 1820.

The Kansas – Nebraska Act of 1854 () created the territories of Kansas and Nebraska, opening new lands for settlement, and had the effect of repealing the Missouri Compromise of 1820 by allowing settlers in those territories to determine through Popular Sovereignty whether they would allow slavery within each territory.

A wave of indignation erupted across the North as anti-slavery elements cried betrayal, for Kansas had been officially closed to slavery since the Missouri Compromise of 1820, and that Compromise was now repealed because of popular sovereignty.

Pierce that read, “ except the eighth section of the act preparatory to the admission of Missouri into the Union, approved March 6, 1820, which was superseded by the legislation of 1850, commonly called the compromise measures, and is declared inoperative .” Identical legislation was soon introduced in the house.

The act itself virtually nullified the Missouri Compromise of 1820 and the Compromise of 1850.

The Missouri Compromise of 1820 was a temporary solution.

* 1820 – The U. S. Congress passes the Missouri Compromise.

On March 15, 1820, it was admitted to the Union as the 23rd state under the Missouri Compromise.

* May 30 – The Kansas-Nebraska Act becomes law, replacing the Missouri Compromise ( of 1820 ), which had already been declared unconstitutional by the Supreme Court of the United States.

Two states were admitted to the union during this decade: Maine in 1820, and Missouri in 1821.

The Missouri Compromise of 1820 prohibited slavery in the former Louisiana Territory north of the parallel 36 ° 30 ′ north except within the boundaries of the proposed state of Missouri.

* March 3, 1820 and March 6, 1820 – Slavery in the United States: The Missouri Compromise becomes law.

The decrease was brought about by the Missouri Compromise of 1820, which made the region of Maine — long part of Massachusetts — a free state to balance the pending admission of slave state Missouri.

Mississippi, Illinois, Alabama and Missouri participated in their first presidential election in 1820, Missouri with controversy, since it was not yet officially a state ( see below ).

The Kansas – Nebraska Act created the territories of Kansas and Nebraska, opening new lands for settlement, and had the effect of repealing the Missouri Compromise of 1820 by allowing settlers in those territories to determine through Popular Sovereignty whether they would allow slavery within each territory.

Texas claimed land north of the 36 ° 30 ' demarcation line for slavery set by the 1820 Missouri Compromise.

As part of the " Great Triumvirate " or " Immortal Trio ," along with his colleagues Daniel Webster and John C. Calhoun, he was instrumental in formulating the Missouri Compromise of 1820 and the Compromise of 1850.

In popular usage, especially since the Missouri Compromise of 1820 ( apparently the first official use of the term " Mason's and Dixon's Line "), the Mason – Dixon Line symbolizes a cultural boundary between the Northeastern United States and the Southern United States ( Dixie ).

Hanover County was also the birthplace of politician Henry Clay, author of the Missouri Compromise of 1820.

In September of 1820, Ampère ’ s friend and eventual eulogist François Arago showed the members of the French Academy of Sciences the surprising discovery of Danish physicist Hans Christian Ørsted that a magnetic needle is deflected by an adjacent electric current.

Although myths and speculation about a Terra Australis (" Southern Land ") date back to antiquity, the first confirmed sighting of the continent of Antarctica is commonly accepted to have occurred in 1820 by the Russian expedition of Fabian Gottlieb von Bellingshausen and Mikhail Lazarev on Vostok and Mirny.

Founded in 1764 prior to American independence from the British Empire as the College in the English Colony of Rhode Island and Providence Plantations early in the reign of King George III ( 1760 – 1820 ), Brown is the third oldest institution of higher education in New England and seventh oldest in the United States.

This article is about the specific period from 1750 to 1820.

The symbol was used by André-Marie Ampère, after whom the unit of electric current is named, in formulating the eponymous Ampère's force law which he discovered in 1820.

The land which is now Columbus was bought by General John Tipton and Luke Bonesteel in 1820.

* 1820 – Cato Street Conspiracy: A plot to murder all the British cabinet ministers is exposed.

A late example of traditional Gothic is Melmoth the Wanderer ( 1820 ) by Charles Maturin which combines themes of Anti-Catholicism with an outcast Byronic hero ( Varma 1986 ).

Ivanhoe is a historical novel by Sir Walter Scott published in 1820, and set in 12th-century England.

Soon after the discovery in 1820 by H. C. Ørsted that a magnetic needle is acted on by a voltaic current, André-Marie Ampère that same year was able to devise through experimentation the formula for the angular dependence of the force between two current elements .< ref >

* 1820 –, the ship that will take Charles Darwin on his scientific voyage, is launched.

* 1820 – 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 ).

* 1820 – Captain Nathaniel Palmer becomes the first American to see Antarctica ( the Palmer Peninsula is later named after him ).

* List of oldest companies, as Nordea is the oldest bank in Sweden, with roots from 1820.

George II ( 1727 – 1760 ) occasionally presided at Cabinet meetings but his grandson, George III ( 1760 – 1820 ), is known to have attended only two during his 60 year reign.

As noted previously, George III ( 1760 – 1820 ) is known to have attended only two Cabinet meetings.

Some feel that the popular use of the term " Regency dance " is not technically correct, as the actual English Regency ( the future George IV ruling on behalf of mad King George III ) lasted only from 1811 until 1820.

In 1820, Wilhelm von Humboldt connected the study of language to the national romanticist program by proposing the view that language is the very fabric of thought.

* The Family Shakspeare, in which nothing is added to the original text ; but those words and expressions are omitted which cannot with propriety be read aloud in a family by Thomas Bowdler in 10 volumes, Facsimile reprint of 2nd edition, revised, in 1820, Eureka Press, 2009.

The term is also used specifically to denote re-creation of the dances of the English Regency ( 1795 – 1820 ), American Civil War ( 1860s ), Victorian, and Ragtime eras.

So it is very likely they were visiting Zambian territory between 1720 and 1820.