Treaty of Waitangi
New Zealand passes under the British Crown

On 6 February 1840 representatives of the British Crown and Māori chiefs signed a treaty bringing New Zealand under British rule. The English and Māori texts differed in meaning, fuelling long disputes; the treaty is regarded as the country's founding document.
Wikipedia (Russian) · Wikipedia (English) · 19th century
Meanwhile around the world (±25 years)
Europe
- 1833 Abolition of slavery in the British Empire — 7 years earlier
- 1839 Birth of photography: the daguerreotype — 1 year earlier
- 1845–1852 Great Famine in Ireland — 5 years later
- 1848–1849 Revolutions of 1848 — 8 years later
- 1861 Unification of Italy — 21 years later
Eastern Europe & Russia
- 1853–1856 Crimean War — 13 years later
- 1861 Emancipation of the serfs in Russia — 21 years later
Middle East
- 1828 Treaty of Turkmenchay — 12 years earlier
- 1839 The Edict of Gülhane opens the Tanzimat — 1 year earlier
- 1839–1842 First Anglo-Afghan War — 1 year earlier
Africa
- c. 1835–1846 The Great Trek — 5 years earlier
- 1847 Liberia declares independence — 7 years later
Asia
- 1815 Eruption of Mount Tambora — 25 years earlier
- 1819 Raffles founds modern Singapore — 21 years earlier
- c. 1831 Hokusai's Great Wave off Kanagawa — 9 years earlier
- 1839–1842 First Opium War — 1 year earlier
- 1853–1854 Commodore Perry's Black Ships — 13 years later
Americas
- 1822 Independence of Brazil — 18 years earlier
- 1835 Darwin in the Galápagos — 5 years earlier
- 1838–1839 Trail of Tears — 2 years earlier
- 1846 First public demonstration of ether anaesthesia — 6 years later
- 1846–1848 Mexican–American War — 6 years later
Alive at the time
- Charles Darwin (aged 31)
- Abraham Lincoln (aged 31)
- Karl Marx (aged 22)
- Queen Victoria (aged 21)
- Fyodor Dostoevsky (aged 19)
- Leo Tolstoy (aged 12)
- Dmitri Mendeleev (aged 6)
- Pyotr Ilyich Tchaikovsky (aged 0)
- Katsushika Hokusai (aged 80)
- Andrew Jackson (aged 73)