* 1770 – Manuel Belgrano, Argentine politician ( d. 1820 )

* June 3 – Manuel Belgrano, Argentine politician and general in the Independence War ( d. 1820 )

* September 26 – Cosme Argerich, Argentine Surgeon General ( d. 1820 )

On 23 February 1820, they signed the Treaty of Pilar, the document that first established the Argentine federal system.

Many other constitutional pacts existed between 1820 and 1853 ( when the current Argentine Constitution was enacted ).

* Sir Oliver Mowat ( 1820 – 1903 ), also considered a Father of Canadian Confederation

During the Mexican War of Independence, the intelligentsia of Yucatán watched the events to the north, and following 1820 organized their own resistance to Spain, forming the Patriotic Confederation, which declared its own independence from Spain in 1821.

* Scipione in Cartagine ( 26 December 1820, Teatro Argentina, Rome )

The government of Martín Rodríguez ( 1820 – 1824 ) and his minister Bernardino Rivadavia, then Las Heras and finally Rivadavia himself as the first president of Argentina from 1826 to 1827, developed an economic plan deemed as " The happy experience ".

The tricolor flag was last flown for the last time in the Battle of the Papers ( Batalla de los Papeles ), but it would appear again raised in the ships that José Miguel Career brought in 1817 and during his campaigns in Argentina ( 1820 – 1821 ).

On 6 November 1820 he raised the flag of the United Provinces of the River Plate at Port Louis and claimed possession of the entire archipelago in the name of the United Provinces of the South ( which later became the United Provinces of The River Plate and ultimately Argentina ).

On 6 November 1820, Jewett raised the flag of the United Provinces of the River Plate ( now Argentina ) at Port Louis.

The province of Santa Fe greatly suffered the civil war that afflicted Argentina after 1820.

* 1820 New York City establishes the General Society of Mechanics and Tradesmen.

Australian English started diverging from British English after the founding of the colony of New South Wales in 1788 and was recognised as being different from British English by 1820.

In 1820, the colony of Cape Breton Island was merged for the second time with Nova Scotia.

They helped send several thousand freed slaves to the new colony of Liberia in Africa from 1820 to 1840.

From 1784 to 1820, Cape Breton Island was established as a separate colony with a Lieutenant Governor and a nominated Executive Council, but without an elected house of assembly.

Due largely to extremely harsh working conditions the colony experienced four slave revolts ; the first in 1765, and the last in 1820.

Such a colony was searched for by many Russian expeditions launched by the Russian-American Company from 1818 on and during the early 1820 ’ s.

In 1820 Sharpe, now retired and living as a farmer in Normandy, is commissioned by the Countess of Mouromorto to find her husband, Don Blas Vivar, who has disappeared in the Spanish colony of Chile ; both she and her husband had encountered Sharpe in 1809, during the events leading up to the assault on Santiago de Compostella.

1820 also saw the first Wesleyan ( Methodist ) meeting in the colony.

In 1784, the island was made a separate colony with its capital at Sydney however by 1820 the colony was remerged into Nova Scotia.

Birch stated before the commission of inquiry into the state of the colony in 1820 that Kelly had discovered Macquarie Harbour after proceeding along in a boat from Port Davey where they had travelled in the schooner Henrietta Packet.

In 1820 the Molotschna colony started a secondary school at Ohrloff, bringing a trained teacher from Prussia.

In 1817 the French pirate Jean Lafitte settled on Galveston Island ; his colony there grew to more than 1, 000 persons by 1818 but was abandoned in 1820.

The French version of this late Rossini opera was a partial rewrite of the composer's 1820 Italian opera, Maometto II, but with exactly the same story and characters, in the setting of the Turks ' 1470 conquest of the Venetian colony of Negroponte.

The Indefatigable brought the first convicts direct from England on 19 October 1812 and by 1820 there were about 2, 500 convicts in the colony.

Ritter proceeded, `` You now emerge into a new epoch in which late in the year 1819 or 1820, you will have to reckon.

The sequence of events leading to his important discovery still remains ambiguous but it seems that one of the advanced students at the university related that the first direct event that led to the publication of Oersted's discovery occurred during a private lecture made before a group of other advanced students in the spring of 1820.

They reached Fort Douglas in June 1820.

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 Russian abacus was brought to France around 1820 by the mathematician Jean-Victor Poncelet, who served in Napoleon's army and had been a prisoner of war in Russia.

Despite compromises in 1820 and 1850, the slavery issues exploded in the 1850s.

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 )

As well as holding positions at this school until 1828, in 1819 and 1820 Ampère offered courses in philosophy and astronomy, respectively, at the University of Paris, and in 1824 he was elected to the prestigious chair in experimental physics at the Collège de France.

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.

* 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.

Anne, the youngest member of the Brontë children, was born on 17 January 1820, at 74 Market Street in Thornton where her father was curate and she was baptised there on 25 March 1820.

In April 1820, the Brontës moved into the a five-roomed Haworth Parsonage which became their home for the rest of their lives.