1856

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File:Edouard Dubufe Congrès de Paris.jpg

March 30: The Congress of Paris by Édouard Dubufe. The Treaty of Paris is signed, ending the Crimean War.

File:Southern Chivalry.jpg

May 22: Senator Charles Sumner is seriously injured by Congressman Preston Brooks on the floor of the U.S. Senate

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Events

January–March

January 8 – Borax deposits are discovered in large quantities by John Veatch in California.<ref>Veatch, John Allen, Texas State Historical Association</ref><ref>Template:Cite book</ref>
January 23 – The American sidewheel steamer SS Pacific leaves Liverpool (England) for a transatlantic voyage on which she will be lost with all 186 on board.<ref name=":Shipping Gazette">Template:Cite news</ref>
January 24 – U.S. President Franklin Pierce declares the new Free-State Topeka government in "Bleeding Kansas" to be in rebellion.
January 26 – First Battle of Seattle: Marines from the Template:USS suppress an indigenous uprising, in response to Governor Stevens' declaration of a "war of extermination" on Native communities.
January 29
- The 223-mile North Carolina Railroad is completed from Goldsboro through Raleigh and Salisbury to Charlotte.<ref>Template:Cite web</ref>
- Queen Victoria institutes the Victoria Cross as a British military decoration.
February
- The Tintic War breaks out in Utah.
- The National Dress Reform Association is founded in the United States to promote "rational" dress for women.
February 1 – Auburn University is first chartered, as the East Alabama Male College.
February 2 – Dallas, Texas, is incorporated as a city.
February 7 – The Nawab of Oudh, Wajid Ali Shah, is exiled to Metiabruz and the state is annexed by the British East India Company.
February 12 – American clipper ships Driver and Ocean Queen leave Liverpool and London respectively; both will be lost without trace in the Atlantic, perhaps due to ice, killing 374 and 123 respectively.<ref>Template:Cite news</ref>
February 18 – The American Know Nothing Party convenes in Philadelphia to nominate their first Presidential candidate, former President Millard Fillmore.
March
- The Great Trigonometrical Survey of India officially gives 'Peak XV' (later to be named Mount Everest) the height of Template:Convert. 'Peak IX' (Kangchenjunga), previously thought to be the world's highest, is confirmed as Template:Convert.
- Mauveine, the first synthetic organic dye, is discovered by William Henry Perkin, while attempting to synthesize quinine. This eventually leads to the birth of the chemical industry.<ref>Template:Cite book</ref>
March – Nepalese–Tibetan War: The signing of the Treaty of Thapathali concludes the war.
March 5 – Fire destroys the Covent Garden Theatre in London.
March 6 – Maryland Agricultural College (modern-day University of Maryland, College Park) is chartered.
March 20 – Filibuster War: Battle of Santa Rosa: – Costa Rican troops rout Walker's soldiers.
March 24 – Taiping Rebellion: Suspecting treachery on the part of East King Yang Xiuqing, Shi Dakai garrisons Anhui and begins his march back to the Heavenly Capital, having defeated a strong Xiang Army detachment.
March 31 – The Treaty of Paris is signed, ending the Crimean War.

File:Covent Garden Theatre 1827-28.jpg

March 5: Covent Garden Theatre fire.

April–June

April – The Xhosa cattle-killing movement and famine begins in Cape Colony.
April 7 – Nelson College is founded in Nelson, New Zealand.
April 10 – Theta Chi international college fraternity is founded at Norwich University in Vermont.
April 16 – The Paris Declaration Respecting Maritime Law abolishes privateering, and regulates the relationship between neutral and belligerent shipping on the high seas.
April 17 – The Chicago Historical Society Museum is established at 1601 N. Clark Street, Chicago.
April 21 – Building workers agitate for the eight-hour day in Melbourne, Australia.
April 29 – The iron-hulled paddle steamer Template:RMS concludes a 9-day 16 hour westbound transatlantic crossing, at an average 13.11 knots (24.28 km/h), regaining the Blue Riband for the Cunard Line.
May 1 – The province of Isabela is created in the Philippines, in honor of Queen Isabella II of Spain.
May 3 – Queen Victoria of the United Kingdom gives Norfolk Island to the population of the colony at Pitcairn Island, most being descendants of the Mutiny on the Bounty. They first settle on Norfolk Island on June 8. Women's suffrage, as practiced on Pitcairn, is extended to Norfolk Island.
May 14 – The San Francisco Committee of Vigilance is founded in the United States. It lynches two gangsters, arrests most Democratic Party officials, and disbands itself on August 18.
May 20 – David Livingstone arrives at Quelimane on the Indian Ocean, having completed a 2-year transcontinental journey across Africa from Luanda.<ref>Template:Cite web</ref>
May 21 – Sacking of Lawrence: Lawrence, Kansas, is captured and burned by pro-slavery forces.
May 22 – Caning of Charles Sumner: United States Congressman Preston Brooks of South Carolina beats Senator Charles Sumner with a cane in the hall of the United States Senate for a speech Sumner had made attacking pro-slavery Southerners, especially elderly South Carolina Senator Andrew Butler, a relative of Brooks. Sumner is unable to return to duty for three years while he recovers; Brooks becomes a hero across the South.
May 24 – Pottawatomie massacre: A group of followers of radical abolitionist John Brown kill 5 homesteaders in Franklin County, Kansas.
June 2 – Battle of Black Jack: Antislavery forces, led by John Brown, defeat proslavery forces in Bleeding Kansas.
June 9 – 500 Mormon handcart pioneers leave Iowa City and head west for Salt Lake City, Utah, carrying all their possessions in two-wheeled handcarts.
June 13 – Taiping Rebellion: Shi Dakai arrives at Nanjing.
June 20 – General Mills is founded in Minneapolis, Minnesota, United States, as the Minneapolis Milling Company.<ref>Template:Cite web</ref>

July–September

July 9 – Natal becomes a British Crown colony.<ref name=CBH>Template:Cite book</ref>
July 14–15 – In Spain, General Leopoldo O'Donnell takes control of the government, bringing an end to the bienio progresista.
July 17 – The Great Train Wreck (the worst railroad calamity in the world to date) occurs near Philadelphia, Pennsylvania, United States.
July 31 – Christchurch, New Zealand, is chartered as a city.
August – Pre-human remains are found in the Neanderthal Valley in Prussia.
August 10 – The Last Island hurricane destroys Last Island, Louisiana, leaving 400 dead. The whole island is broken up into several smaller islands by the storm.
August 30 – Battle of Osawatomie: Proslavery forces defeat antislavery forces in Bleeding Kansas.
September 1 – Seton Hall University is founded in South Orange, New Jersey, by Roman Catholic Bishop of Newark James Roosevelt Bayley, a cousin of future U.S. President Theodore Roosevelt and nephew of Saint Elizabeth Ann Seton.
September 2 – Taiping Rebellion: Wei Changhui and Qin Rigang assassinate Yang Xiuqing.
September 7 – The Saimaa Canal was inaugurated.<ref>Template:Cite magazine</ref>

October–December

October 8 – The Second Opium War between several Western powers and China begins with the Arrow Incident on the Pearl River.
October 12 – 1856 Heraklion earthquake: A powerful earthquake rocks the Mediterranean, killing hundreds on the island of Crete and many more in the Middle East.
October 13 – American mercenary William Walker effectively takes control of Nicaragua.
November 1 – Anglo-Persian War: War is declared between Great Britain and Persia.
November 4 – 1856 United States presidential election: Democrat James Buchanan defeats former President Millard Fillmore, representing a coalition of Know Nothings and Whigs, and John C. Frémont of the fledgling Republican Party, to become the 15th President of the United States.
November 11 – Taiping Rebellion: Shi Dakai arrives at the Heavenly Capital once more with 100,000 men, and demands that Wei Changhui and Qin Rigang be executed. Shi subsequently becomes head of the government.
November 17 – American Old West: On the Sonoita River in modern-day southern Arizona, the United States Army establishes Fort Buchanan, in order to help control new land acquired in the Gadsden Purchase.
November 21 – Niagara University is founded in Niagara Falls, New York.
November 27 – The Coup of 1856 leads to Luxembourg's unilateral adoption of a new, reactionary constitution, as King-Grand Duke William III signs the new constitution without the Chamber of Deputies' consent.
December 1 – Under the County and Borough Police Act, in any county or area of England and Wales where a police force has not already been established, the Justices of the Peace must from this date take steps to create one according to nationally defined standards.<ref>Template:Cite book</ref>
December 2 – The National Portrait Gallery, London, is established.<ref>Template:Cite web</ref>
December 9 – Bushehr surrenders to the British.

Date unknown

Gregor Mendel starts his research on genetics.
Kate Warne, the first female private detective, begins to work for the Pinkerton Detective Agency.
Legal protection of widow remarriage is extended in India.
St. Paul's School, Belgaum, is founded by the Jesuits in Belgaum, India.
The British Guiana 1c magenta postage stamp is issued in British Guiana in limited numbers; the one surviving specimen will become regarded as the world's rarest stamp.<ref>Template:Cite book</ref>
Global financial services business Credit Suisse is founded as La Schweizerische Kreditanstalt.<ref>Template:Cite web</ref>
Charles III of Monaco grants a concession to Napoléon Langlois and Albert Aubert to establish a German-style casino at Monte Carlo.<ref>Template:Cite web</ref>