6th February » The first minstrel show in the United States, The Virginia Minstrels, opens (Bowery Amphitheatre in New York City).
25th February » Provisional Cession of the Hawaiian or Sandwich Islands established by Lord George Paulet.
16th May » The first major wagon train heading for the Pacific Northwest sets out on the Oregon Trail with one thousand pioneers from Elm Grove, Missouri.
18th May » The Disruption of 1843 or Disruption in Edinburgh of the Free Church of Scotland (1843–1900) or Free Church of Scotland from the Church of Scotland.
17th June » The Wairau Affray, the first serious clash of arms between Māori people or Māori and British settlers in the New Zealand Wars, takes place.
26th June » Treaty of Nanking comes into effect, Hong Kong Island is ceded to the British "in perpetuity".
15th August » The Cathedral of Our Lady of Peace in Honolulu or Honolulu, Hawaii is dedicated. Now the cathedral of the Roman Catholic Diocese of Honolulu, it is the oldest Catholic Church or Roman Catholic cathedral in continuous use in the United States.
15th August » Tivoli Gardens, one of the oldest still intact amusement parks in the world, opens in Copenhagen, Denmark.
13th September » The Greek Army 3 September 1843 Revolution called rebels (Old Style and New Style dates known as OS date: September 3) against the autocratic rule of king Otto of Greece, demanding the granting of a constitution.
21st September » John Williams Wilson takes possession of the Strait of Magellan on behalf of the newly independent Chilean government.
1st October » The 'News of the World' Tabloid (newspaper format) Europe or tabloid begins publication in London.
16th October » Sir William Rowan Hamilton comes up with the idea of quaternions, a commutativity named non-commutative extension of complex numbers.
28th November » Kingdom of Hawaii Anglo-Franco Proclamation or Ka Lā Hui (Hawaiian Independence Day): The Kingdom of Hawaii is officially recognized by the United Kingdom and France as an independent nation.
Famous Birthdays in 1843
8th January » Frederick Abberline, English police officer (d. 1929)
8th January » John H. Moffitt, American soldier and politician, Medal of Honor recipient (d. 1926)
10th January » Frank James, American soldier and outlaw (d. 1915)
24th January » Josip Štadler, Croatian archbishop (d. 1918)
28th January » Mihkel Veske, Estonian poet and linguist (d. 1890)
29th January » William McKinley, American politician, 25th President of the United States (d. 1901)
3rd February » William Cornelius Van Horne, American-Canadian businessman (d. 1915)
6th February » Inoue Kowashi, Japanese politician (d. 1895)
6th February » Frederic William Henry Myers, English poet and philologist, co-founded the Society for Psychical Research (d. 1901)
12th February » John Graham Chambers, English race walker (d. 1883)
19th February » Adelina Patti, Spanish opera singer (d. 1919)
2nd March » Princess Maria Clotilde of Savoy (d. 1911)
27th March » George Frederick Leycester Marshall, English colonel and entomologist (d. 1934)
4th April » William Henry Jackson, American painter and photographer (d. 1942)
15th April » Henry James, American-English author (d. 1916)
25th April » Princess Alice of the United Kingdom (d. 1878)
2nd May » Elijah McCoy, Canadian-American engineer (d. 1929)
5th May » William George Beers, Canadian dentist and patriot (d. 1900)
6th May » Grove Karl Gilbert, American geologist (d. 1918)
10th May » Benito Pérez Galdós, Spanish author (d. 1920)
21st May » Charles Albert Gobat, Swiss lawyer and politician, Nobel Peace Prize e.g Nobel Prize laureate (d. 1914)
1st June » Henry Faulds, Scottish physician and missionary, developed fingerprinting (d. 1930)