Centuries: 18th century - 19th century - 20th century

Decades: 1770s 1780s 1790s 1800s 1810s - 1820s - 1830s 1840s 1850s 1860s 1870s

Years: 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829

• 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 Colombia under President Simón Bolívar (1819 - 1828) expands over South America
    • Mexico (1821)
    • Brazil (1822)
• The United Provinces of Central America were formed in 1823.