1840-1842 жылдардағы оқиғалар шолуы

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January 20 – Charles Elliot of the United Kingdom, and Qishan of the Qing dynasty, agree to the Convention of Chuenpi. January 26 – Britain occupies Hong Kong. Later in the year, the first census of the island records a population of about 7,500. January 27 – The active volcano Mount Erebus in Antarctica is discovered, and named by James Clark Ross. January 28 – Ross discovers the "Victoria Barrier", later known as the Ross Ice Shelf. On the same voyage, he discovers the Ross Sea, Victoria Land and Mount Terror. January 30 – A fire ruins and destroys two thirds of the villa (modern day city) of Mayagüez, Puerto Rico. February 4 – First known reference to Groundhog Day in North America, in the diary of a James Morris. February 10 – The Act of Union (British North America Act, 1840) is proclaimed in Canada. February 11 – The two colonies of the Canadas are merged, into the United Province of Canada. February 18 – The first ongoing filibuster in the United States Senate begins, and lasts until March 11. February – El Salvador proclaims itself an independent republic, bringing an end to the (already de facto defunct) Federal Republic of Central America. March 4 – William Henry Harrison is sworn in as the ninth president of the United States. March 9 – United States v. The Amistad: The Supreme Court of the United States rules in the case, that the Africans who seized control of the ship had been taken into slavery illegally. March 12 – , commanded by legendary captain Richard Roberts ("I'd Go to Sea in a Bathtub"), founders in rough seas, with all passengers and crew lost.

April 4 – President William Henry Harrison dies of pneumonia, aged 68, becoming the first president of the United States to die in office, and at one month, the American president with the shortest term served. He is succeeded by Vice President John Tyler, who becomes the tenth president of the United States. April 6 – President John Tyler is sworn in. May – The Sino Sikh War begins. May 3 – New Zealand becomes a separate British colony, having previously been administered as part of the Colony of New South Wales. May 22 – The Georgian province of Guria revolts against the Russian Empire. June 6 – The United Kingdom Census is held, the first to record names and approximate ages of every household member, and to be administered nationally. June 21 – St. John's College (later Fordham University) is founded in The Bronx, by the Society of Jesus. June 28 – The ballet Giselle is first presented by the Ballet du Théâtre de l'Académie Royale de Musique, at the Salle Le Peletier in Paris, France, with music by Adolphe Adam and Italian ballerina Carlotta Grisi in the title role.

October 10 – First Opium War: Battle of Chinhai – British capture a Chinese garrison. October 13 – First Opium War: British occupy Ningbo. October 16 – Queen's University is founded in Kingston, Ontario, by Rev. Thomas Liddell, who carries a Royal Charter from Queen Victoria, and becomes the school's first principal. October 30 – A fire at the Tower of London destroys its Grand Armoury and causes a quarter of a million pounds' worth of damage. November – The settlement of Dallas, Texas, is founded by John Neely Bryan. November 13 – Scottish surgeon James Braid first sees a demonstration of animal magnetism by Charles Lafontaine in Manchester, which leads to his study of the phenomenon that he (Braid) eventually calls hypnotism. December 20 – The first multilateral treaty for the suppression of the African slave trade, the Treaty for the Suppression of the African Slave Trade, signed in London by the representatives of Austria, Britain, France, Prussia and Russia. December 23 – First Anglo Afghan War: At a meeting with the Afghan general Akbar Khan, British diplomat Sir William Hay Macnaghten is shot dead at close quarters.

John Augustus develops the concept of probation in Boston, Massachusetts.

Arousyak Papazian, Armenian actress, writer (d. 1907)

July – Mary Rogers ("Beautiful Cigar Girl"), American murder victim (b. c. 1820)
August 16 – Fernando Errázuriz Aldunate, Chilean politician, President of Chile (b. c 1777)
August 24 – Theodore Edward Hook, English author (b. 1788)
September 25 – John Chandler, American politician (b. 1762)
October 9 – Karl Friedrich Schinkel, German architect (b. 1781)
November 18 – Agustín Gamarra, Peruvian general and politician, 10th and 14th President of Peru (b. 1785)
December 4 – David Daniel Davis, British physician (b. 1777)
December 23 – William Hay Macnaghten, Anglo Indian diplomat (b. 1793)