Mexican–American War
Mexico loses about half its territory

After the US annexed Texas in 1845, a border dispute turned into war. In September 1847 American troops stormed Chapultepec Castle, where young cadets, the Niños Héroes still honoured in Mexico, fell, and entered Mexico City. Under the Treaty of Guadalupe Hidalgo in 1848 Mexico ceded California, New Mexico and other lands, about half its territory.
Wikipedia (Russian) · Wikipedia (English) · 19th century
Meanwhile around the world (±25 years)
Europe
- 1839 Birth of photography: the daguerreotype — 7 years earlier
- 1845–1852 Great Famine in Ireland — 1 year earlier
- 1848–1849 Revolutions of 1848 — 2 years later
- 1848 The Communist Manifesto — 2 years later
- 1861 Unification of Italy — 15 years later
Eastern Europe & Russia
- 1853–1856 Crimean War — 7 years later
- 1861 Emancipation of the serfs in Russia — 15 years later
- 1867 Alaska Purchase — 21 years later
- 1869 Tolstoy's War and Peace — 23 years later
Middle East
- 1828 Treaty of Turkmenchay — 18 years earlier
- 1839 The Edict of Gülhane opens the Tanzimat — 7 years earlier
- 1839–1842 First Anglo-Afghan War — 7 years earlier
Africa
- c. 1835–1846 The Great Trek — 11 years earlier
- 1847 Liberia declares independence — 1 year later
- 1869 Opening of the Suez Canal — 23 years later
Asia
- c. 1831 Hokusai's Great Wave off Kanagawa — 15 years earlier
- 1839–1842 First Opium War — 7 years earlier
- 1853–1854 Commodore Perry's Black Ships — 7 years later
- 1868 Meiji Restoration — 22 years later
Oceania
- 1851 The Australian gold rushes — 5 years later
Alive at the time
- Charles Darwin (aged 37)
- Abraham Lincoln (aged 37)
- Karl Marx (aged 28)
- Queen Victoria (aged 27)
- Fyodor Dostoevsky (aged 25)
- Leo Tolstoy (aged 18)
- Dmitri Mendeleev (aged 12)
- Pyotr Ilyich Tchaikovsky (aged 6)
- Katsushika Hokusai (aged 86)
- Muhammad Ali of Egypt (aged 77)