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| | | | World History timeline |
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| 1821 |
| | | French physicist Augustin Jean Fresnel publishes the theory that light is a transverse wave, thus explaining polarization effects | |
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| 1821 |
| | | Carl Maria von Weber's opera Der Freischutz has its premiere in Berlin | |
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| 1821 |
| | | San Martín enters Lima and proclaims Peruvian independence with himself as 'Protector' | |
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| 1821 |
| | | Bolívar defeats the Spanish at Carabobo and liberates, for the second time, his native city of Caracas | |
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| 1821 |
| | | English author William Hazlitt publishes Table Talk, a two-volume collection that includes most of his best-known essays | |
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| 1821 |
| | | A reactionary movement led by Agustín de Iturbide wins new and lasting independence for Mexico | |
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| 1821 |
| | | During his coronation George IV has the doors of Westminster Abbey closed against his queen, Caroline | |
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| c. 1821 |
| | | The Shaker settlements, now widespread in the US, form The United Society of Believers in Christ's Second Appearing | |
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| 1821 |
| | | The spoken language of the Cherokee Indians is captured in written form – an achievement traditionally attributed to Sequoyah | |
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| 1821 |
| | | The Saturday Evening Post is launched in Philadelphia as a weekly to provide light Sunday reading | |
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| 1821 |
| | | The Sante Fe Trail, from Missouri to New Mexico, is opened up by the US trader William Becknell | |
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| 1821 |
| | | The Cortes in Lisbon passes a liberal constitution which they persuade the king, John VI, to accept | |
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| 1821 |
| | | The American Colonization Society buys the area later known as Liberia to settle freed slaves | |
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| 1821 |
| | | Stephen Austin begins the process of American settlement in the Mexican province of Texas | |
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| 1822 |
| | | Egyptian hieroglyphs are deciphered by French Egyptologist Jean François Champollion, using the Rosetta stone | |
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| 1822 |
| | | George Canning becomes the British foreign secretary for the second time, in Lord Liverpool's government | |
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| 1822 |
| | | After defeating the Spanish at Pichincha, Antonio José de Sucre enters Quito and liberates Ecuador | |
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| 1822 |
| | | Agustin de Iturbide declares himself emperor of the new nation of Mexico, as Agustin I | |
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| 1822 |
| | | George IV wears a tartan kilt when visiting Edinburgh, and launches a new craze for Highland dress | |
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| 1822 |
| | | French physicist Augustin Jean Fresnel develops a more efficient form of lens for use in lighthouses | |
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| 1822 |
| | | Mzilikazi, after a quarrel with Shaka, leads the Ndebele people to new territories west of Natal | |
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| 1822 |
| | | Walter Scott begins to transform Abbotsford into a romantic house that he refers to as his 'conundrum castle' | |
|  | Abbotsford House
Fotofile CG
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| 1822 |
| | | Percy Bysshe Shelley drowns when sailing in the gulf of Spezia, in northwest Italy, at the age of 29 | |
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| 1822 |
| | | The two liberators, Bolívar and San Martín, meet in Guayaquil for a conference | |
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| 1822 |
| | | After failing to agree with Bolívar at Guayaquil, San Martín resigns his post as Protector of Peru | |
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| 1822 |
| | | The Portuguese regent, Dom Pedro, proclaims the independence of Brazil and three months later is crowned emperor, as Pedro I | |
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| 1822 |
| | | The first shipload of freed slaves reaches Cape Mesurado (in the region soon called Liberia) from the USA | |
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| 1822 |
| | | Austrian composer Franz Schubert begins, but never completes, the great work now known as his 'Unifinished' symphony (no 8.in B minor) | |
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| 1823 |
| | | Bernardo O'Higgins, Chile's first liberal reformer, is so unpopular that he has to resign | |
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| 1823 |
| | | Lord Byron arrives in Greece to support the cause of Greek independence | |
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| 1823 |
| | | Guatemala declares independence following the example of neighbouring Mexico | |
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| 1823 |
| | | Daniel O'Connell organizes Catholic Associations throughout Ireland, funded by the members' penny subscriptions | |
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| 1823 |
| | | 12-year-old Hungarian pianist Franz Liszt wins a reputation as a virtuoso performer | |
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