France invades Algiers
A swat with a fly-whisk leads to 132 years of French rule

The pretext was the 1827 'fly-whisk incident', when the Dey of Algiers struck the French consul. In June 1830 a French army landed at Sidi Ferruch and took Algiers on 5 July; the Dey abdicated, and the conquest of the country dragged on for decades — Algeria stayed French until 1962.
Wikipedia (Russian) · Wikipedia (English) · 19th century
Meanwhile around the world (±25 years)
Europe
- 1814–1815 Congress of Vienna — 16 years earlier
- 1830 July Revolution — same year
- 1830 Belgian Revolution — same year
- 1833 Abolition of slavery in the British Empire — 3 years later
- 1845–1852 Great Famine in Ireland — 15 years later
Eastern Europe & Russia
- 1807 Treaties of Tilsit — 23 years earlier
- 1812 Napoleon's invasion of Russia — 18 years earlier
- 1812 Battle of Borodino — 18 years earlier
- 1853–1856 Crimean War — 23 years later
Middle East
- 1828 Treaty of Turkmenchay — 2 years earlier
- 1839 The Edict of Gülhane opens the Tanzimat — 9 years later
- 1839–1842 First Anglo-Afghan War — 9 years later
Asia
- 1815 Eruption of Mount Tambora — 15 years earlier
- 1819 Raffles founds modern Singapore — 11 years earlier
- c. 1831 Hokusai's Great Wave off Kanagawa — 1 year later
- 1839–1842 First Opium War — 9 years later
- 1853–1854 Commodore Perry's Black Ships — 23 years later
Americas
- 1822 Independence of Brazil — 8 years earlier
- 1823 Monroe Doctrine — 7 years earlier
- 1824 Battle of Ayacucho — 6 years earlier
- 1835 Darwin in the Galápagos — 5 years later
- 1838–1839 Trail of Tears — 8 years later
Oceania
- 1851 The Australian gold rushes — 21 years later
Alive at the time
- Johann Wolfgang von Goethe (aged 81)
- Simón Bolívar (aged 47)
- Alexander Pushkin (aged 31)
- Charles Darwin (aged 21)
- Abraham Lincoln (aged 21)
- Karl Marx (aged 12)
- Queen Victoria (aged 11)
- Fyodor Dostoevsky (aged 9)
- Leo Tolstoy (aged 2)
- Katsushika Hokusai (aged 70)