* 1821 – Ford Madox Brown, English painter ( d. 1893 )

* 1769 – Napoleon, Corsican-French military officer and political leader ( d. 1821 )

* 1821 – Jarvis Island is discovered by the crew of the ship, Eliza Frances.

* 1774 – Elizabeth Ann Seton, American nun and saint ( d. 1821 )

* 1821 – Anita Garibaldi, Brazilian wife of Giuseppe Garibaldi ( d. 1849 )

Anne's mother, Maria Branwell ( 1783 – 1821 ), was the daughter of Thomas Branwell, a successful, property-owning grocer and tea merchant in Penzance and Anne Carne, the daughter of a silversmith.

* 1821 – Missouri is admitted as the 24th U. S. state.

* 1821 – Jay Cooke, American financier, founded Jay Cooke & Company ( d. 1905 )

* 1821 – Atkinson & Alexander publish The Saturday Evening Post for the first time as a weekly newspaper.

* 1821 – Louis Vuitton, French fashion designer, founded Louis Vuitton ( d. 1892 )

* 1821 – James Springer White, American theologian ( d. 1881 )

* 1821 – Patriarch Gregory V of Constantinople is hanged by the Ottoman government from the main gate of the Patriarchate and his body is thrown into the Bosphorus.

People starting with John Oxley in 1817, 1818 and 1821, followed by Charles Sturt in 1829 – 1830 attempted to follow the westward-flowing rivers to find an " inland sea ", but these were found to all flow into the Murray River and Darling River which turn south.

Men Playing Board Games – from The Sougandhika Parinaya Manuscript ( 1821 CE )

# Napoléon ( I ) Bonaparte ( 1769 – 1821 ) Emperor

* Christian ( French actor ) ( 1821 – 1889 ), stage name of Christian Perrin, a 19th-century French actor and singer

* The Consulate of Argos ( from 26 May 1821, under the Senate of the Peloponnese ) had a single head of state, styled consul, 28 March 1821 – 26 May 1821: Stamatellos Antonopoulos

* The Consulate of East Greece ( Livadeia ) ( from 15 November 1821, under the Areopagus of East Greece ) was headed 1 April 1821 – 15 November 1821 by three Consuls: Lambros Nakos, Ioannis Logothetis & Ioannis Filon

* Frederick William Cumberland ( 1821 – 1881 ), engineer and politician

** Edward Levett Darwin ( 1821 – 1901 ), solicitor and author

Resumed Ottomans rule in Aegina and the Morea was confirmed in the Treaty of Passarowitz, and they retained control of the island with the exception of a short-lived Russian occupation, until the outbreak of the Greek War of Independence in 1821.

The Adams – Onís Treaty with Spain ( 1819 ) resolved the issue upon ratification in 1821.

Santorini became independent from Ottoman rule in 1821, during the Greek War of Independence and was united with Greece in 1830 under the Treaty of London.

The Adams – Onís Treaty, signed in 1819 and ratified by Spain in 1821, ceded Florida to the United States, and established a boundary between New Spain and the United States.

On August 24, 1821, representatives of the Spanish crown and Iturbide signed the Treaty of Córdoba, which recognized the Mexican Empire under the terms of the Plan of Iguala.

However the nation was satisfied by the diplomacy that produced the Convention of 1818 with Britain and the Adams-Onis Treaty of 1819 with Spain, the need for a large army disappeared, and Calhoun could not prevent cutbacks in 1821.

* Columbia District, the trading district of the Columbia Department of the Hudson's Bay Company from 1821 to the Oregon Treaty of 1846, by which most of the Columbia District was formally annexed to the United States.

In 1821 Treaty of Córdoba established Mexican independence from Spain and concluded the War.

The U. S. acquired Florida from Spain via the Adams-Onís Treaty and took possession in 1821.

In 1821, the United States purchased Florida from Spain ( see Adams-Onís Treaty ), partly to reduce Indian raids, and partly to eliminate a refuge for escaped slaves from neighboring Southern states.

The township included all lands acquired from the Native Americans by the Treaty of Chicago of 1821.

Antrim was originally named Meegisee ( meaning " eagle "), which was the name of a Chippewa chief who signed the 1821 Treaty of Chicago and the 1826 Treaty of Mississinwas.

The Treaty of Indian Springs ( 1821 ) between the United States and the Creek Indians gave the government the land that extended from the Ocmulgee River to the Flint River through middle Georgia.

Henry County, Georgia was created by the Georgia State Legislature in 1821 from land acquired from the Creek Indian Nation by the First Treaty of Indian Springs.

The county was created on December 9, 1822, from Houston County, which had been formed from land given up by the Creek Indians in the 1821 Treaty of Indian Springs.

In 1819 the United States and Spain signed the Adams-Onís Treaty, which took effect in 1821.

The Red River formed part of the US-Mexico border from the Adams-Onís Treaty ( in force 1821 ) until the Texas Annexation or Treaty of Guadalupe Hidalgo.

Spain finally recognized the independence of Mexico with the Treaty of Córdoba signed on August 24, 1821.

Faced with the prospect of losing control, Spain formally ceded all of its Florida territory to the U. S. under the Adams-Onís Treaty in 1819 ( ratified in 1821 ) in exchange for the U. S. ceding its claims on Texas and the U. S. paying any claims its citizens might have against Spain up to $ 5, 000, 000.

The Arkansas from its headwaters to the 100th meridian west formed part of the US-Mexico border from the Adams-Onís Treaty ( in force 1821 ) until the Texas Annexation or Treaty of Guadelupe Hidalgo.

These battles continued until 21 August 1821, when Iturbide and Spanish Viceroy Juan O ' Donojú signed the Treaty of Córdoba.