Monroe Doctrine
The US declares the Americas closed to European colonization

On 2 December 1823 President James Monroe told Congress that any European attempt to colonize the Western Hemisphere or to meddle in its new republics would be seen as hostile to the United States. In return the US promised to stay out of Europe's affairs.
Wikipedia (Russian) · Wikipedia (English) · 19th century
Meanwhile around the world (±25 years)
Europe
- 1804 Coronation of Napoleon — 19 years earlier
- 1814–1815 Congress of Vienna — 9 years earlier
- 1816 Year Without a Summer — 7 years earlier
- 1821–1829 Greek War of Independence — 2 years earlier
- 1845–1852 Great Famine in Ireland — 22 years later
Eastern Europe & Russia
- 1807 Treaties of Tilsit — 16 years earlier
- 1812 Napoleon's invasion of Russia — 11 years earlier
- 1812 Battle of Borodino — 11 years earlier
Middle East
- 1828 Treaty of Turkmenchay — 5 years later
- 1839 The Edict of Gülhane opens the Tanzimat — 16 years later
- 1839–1842 First Anglo-Afghan War — 16 years later
Africa
- 1804–1903 Usman dan Fodio's jihad and the Sokoto Caliphate — 19 years earlier
- 1805–1848 Muhammad Ali becomes ruler of Egypt — 18 years earlier
- 1830 France invades Algiers — 7 years later
- c. 1835–1846 The Great Trek — 12 years later
- 1847 Liberia declares independence — 24 years later
Asia
- 1815 Eruption of Mount Tambora — 8 years earlier
- 1817–1824 First cholera pandemic — 6 years earlier
- 1819 Raffles founds modern Singapore — 4 years earlier
- c. 1831 Hokusai's Great Wave off Kanagawa — 8 years later
- 1839–1842 First Opium War — 16 years later
Alive at the time
- Johann Wolfgang von Goethe (aged 74)
- Ludwig van Beethoven (aged 53)
- Simón Bolívar (aged 40)
- Alexander Pushkin (aged 24)
- Charles Darwin (aged 14)
- Abraham Lincoln (aged 14)
- Karl Marx (aged 5)
- Queen Victoria (aged 4)
- Fyodor Dostoevsky (aged 2)
- Thomas Jefferson (aged 80)