1820sEvents and Trends Nationalistic independence movements helped reshape the world during this decade: Greece declares independence from the Ottoman Empire ( 1821). Several countries declared their independence from Spain and Portugal: The Republic of Gran C	1820Events January 1 Constitutionalist military insurrection at Cadiz leads to summoning of Spanish parliament ( March 7) and restoration of 1812 Constitution ( March 8) by king Ferdinand VII. January 29 George the Prince Regent becomes king George IV of the	1820 in literatureSee also 1819 in literature, other events of 1820, 1821 in literature, list of years in literature. Events Robert Chambers's publishing company publishes The Songs of Robert Burns. November 20 An 80-ton sperm whale attacks the Essex (a whaling ship from N
1820s in sportsSee also 1810s in sports, 1830s in sports and the list of 'years in sports'. Boat race First Oxford and Cambridge Boat Race contested won by Oxford (1829) Rugby football William Webb Ellis said to have invented rugby (1823) Births Deaths 1820s.	1820 in musicSee also 1819 in music, other events of 1820, 1821 in music and the list of 'years in music'. Events Published popular music Births January 9 Pavel Krizkovsky March 7 Gustav Heinrich Graben-Hoffman August 30 George Frederick Root, US composer October 6 Je	1820 in scienceSee also Other events of 1820 List of years in science. 1819 in science 1820 in science 1821 in science. The year 1820 in science and technology included many events, some of which are listed here. Astronomy Royal Astronomical Society founded Biology Chri
1820 in Canada	1820 in architecture

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