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1845 ( MDCCCXLV) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1845th year of the Common Era (CE) and (AD) designations, the 845th year of the Anno Domini 2nd millennium, the 45th year of the 19th century, and the 6th year of the 1840s decade. As of the start of 1845, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
January 10 – Elizabeth Barrett receives a love letter from the younger poet Robert Browning; on  May 20, they meet for the first time in London. She begins writing her . Sonnets from the Portuguese
January 23 – The United States Congress establishes a uniform date for federal elections, which will henceforth be held on the first Tuesday after the first Monday in November.
January 29 – by The Raven Edgar Allan Poe is published for the first time, in the . New York Evening Mirror
February 1 – Anson Jones, President of the Republic of Texas, signs the charter officially creating Baylor University (the oldest university in the State of Texas operating under its original name).
February 7 – In the British Museum, a drunken visitor smashes the Portland Vase, which takes months to repair.
February 28 – The United States Congress approves the annexation of Texas.
March 1 – President John Tyler signs a bill authorizing the United States to annex the Republic of Texas.
March 4 – James K. Polk is sworn in, as the 11th President of the United States.
March 11 – New Zealand Wars open with the Flagstaff War: Chiefs Kawiti and Hone Heke lead 700 M?oris, in the burning of the British colonial settlement of Koror?reka (modern-day Russell, New Zealand).
March 13 – The by Violin Concerto Felix Mendelssohn premieres in Leipzig, with Ferdinand David as soloist.
March 17 – Stephen Perry patents the rubber band, in the United Kingdom.  March 30 – Due to different transition dates to the Gregorian calendar, Finland (then part of the Russian Empire) is the only place in the world to have Easter day on this particular Sunday.
April 7 – An earthquake destroys part of Mexico City, along with the nearby towns of Tlalpan and Xochimilco.
April 10 – A great fire destroys much of the American city of Pittsburgh.
April 20 – Ramón Castilla becomes president of Peru.
May – Frederick Douglass's autobiographical is published by the Narrative of the Life of Frederick Douglass, an American Slave Boston Anti-Slavery Society.
May 2 – Yarmouth suspension bridge in Great Yarmouth, England, collapses leaving around 80 dead, mostly children. 
May 19 – HMS and Erebus HMS , with 134 men, comprising Sir Terror John Franklin's expedition to find the Northwest Passage, sail from Greenhithe on the Thames. They will last be seen in the summer, entering Baffin Bay. 
May 30 – ( Fatel Razack Fath Al Razack, "Victory of Allah the Provider", Arabic: ) is the first ship to bring indentured labourers from India to Trinidad and Tobago, landing in the Gulf of Paria with 227 immigrants.  June 8 – Former U.S. President Andrew Jackson dies, at the Hermitage in Tennessee.
October 9 – The eminent and controversial Anglican, John Henry Newman, is received into the Roman Catholic Church.
October 10 – In Annapolis, Maryland, the Naval School (later renamed the United States Naval Academy) opens with fifty midshipmen and seven professors.
October 13 – A majority of voters in the Republic of Texas approve a proposed constitution, that if accepted by the United States Congress, will make Texas a U.S. state.
October 19 – Richard Wagner's opera debuts at the Tannhäuser Dresden Royal Court Theater.
October 21 – The becomes the first newspaper to mention the game of baseball. New York Herald
November 20 – Anglo-French blockade of the Río de la Plata – Battle of Vuelta de Obligado: The Argentine Confederation is narrowly defeated by an Anglo-French fleet on the waters of the Paraná River, but the victors suffer serious damage to their ships, and Argentina attracts political support in South America.
December 2 – Manifest destiny: U.S. President James K. Polk announces to Congress that the Monroe Doctrine should be strictly enforced, and that the United States should aggressively expand into the West.
December 11 – First Anglo-Sikh War: Sikh army crosses the Sutlej in the Punjab.
December 22– 23 – Battle of Ferozeshah (Anglo-Sikh War): East India Company forces are victorious over those of the Sikh Empire.
December 29 – Texas is admitted as the 28th U.S. state. December 30 – Queen's Colleges of Belfast, Cork, and Galway are incorporated in Ireland.
January 7 – King Ludwig III of Bavaria (d. 1921)
February 2 – Ivan Puluj, Ukrainian physicist, inventor (d. 1918)
February 14 – Quintin Hogg, British philanthropist (d. 1903)
February 15 – Elihu Root, American statesman, diplomat, recipient of the Nobel Peace Prize (d. 1937)
February 25 – Sir George Reid, 4th Prime Minister of Australia (d. 1918)
March 3 – Georg Cantor, German mathematician (d. 1918)
March 4 – Henry Clay Taylor, American admiral (d. 1904)
March 10 – Emperor Alexander III of Russia (d. 1894)
March 20 – Victor Child Villiers, 7th Earl of Jersey, 18th Governor of New South Wales (d. 1915)
March 27 – Wilhelm Röntgen, German physicist, Nobel Prize laureate (d. 1923)
April 4 – Franti?ek Plesnivý, Austro-Hungarian architect (d. 1918)
April 22 – Carlo Caneva, Italian general (d. 1922)
April 24 – Carl Spitteler, Swiss writer, Nobel Prize laureate (d. 1924)
May 4 – William Kingdon Clifford, English mathematician, philosopher (d. 1879)
May 9 – Gustaf de Laval, Swedish engineer, inventor (d. 1913)
May 12 – Gabriel Fauré, French composer (d. 1924)
May 14 – Charles J. Train, American admiral (d. 1906)
May 15 – Élie Metchnikoff, Russian microbiologist, recipient of the Nobel Prize in Physiology or Medicine (d. 1916)
May 17 – Jacint Verdaguer, Catalan poet (d. 1902)
May 25 – Eugène Grasset, Swiss-born artist (d. 1917)
May 30 – King Amadeo I of Spain (d. 1890)
June 7 – Leopold Auer, Hungarian violinist, composer (d. 1930)
June 18 – Charles Louis Alphonse Laveran, French physician, recipient of the Nobel Prize in Physiology or Medicine (d. 1922) June 22 – Richard Seddon, 15th Prime Minister of New Zealand (d. 1906)
July 4 – Thomas John Barnardo, Irish philanthropist (d. 1905)
July 19 – Horatio Nelson Young, American naval hero (d. 1913)
August 9 – André Bessette, Canadian religious leader and saint (d. 1937)
August 10 – Abai Qunanbaiuly, Kazakh poet (d. 1904)
August 19 – Edmond James de Rothschild, French philanthropist (d. 1934)
August 20 – Albert Chmielowski, Polish painter, Roman Catholic religious professed and saint (d. 1916)
August 21 – William Healey Dall, American naturalist, biologist and explorer (d. 1927)
August 25 – King Ludwig II of Bavaria (d. 1886)
September 1 – Paul Methuen, 3rd Baron Methuen, British field marshal (d. 1932)
September 9 – Warner B. Bayley, United States Navy rear admiral (d. 1928)
September 11 – Emile Baudot, French telegraph engineer and inventor (d. 1903)
October 13 – Charles Stockton, American admiral (d. 1924)
October 21 – William McKendree Carleton, American poet (d. 1912)
November 3 – Edward Douglass White, 9th Chief Justice of the United States (d. 1921)
November 4 – Vasudev Balwant Phadke, Indian revolutionary (d. 1883)
November 10 – Sir John Thompson, 4th Prime Minister of Canada (d. 1894)
November 13 – Marta Abreu, Cuban philanthropist (d. 1909)
December 9 – Joel Chandler Harris, American writer (d. 1908) December 24 – George I of Greece, king from 1863 to 1913 (d. 1913)
January 11 – Etheldred Benett, British geologist (b. 1776)
January 28 – Mary Ann Browne, British poet and writer of musical scores (b. 1812)
February 13 – Henrik Steffens, Norwegian philosopher (b. 1773)
February 22 – William Wellesley-Pole, 3rd Earl of Mornington, British politician (b. 1763) March –
Nicolás Espinoza, Head of State of El Salvador (b. 1795)
March 18 – Johnny Appleseed, American pioneer (b. 1774)
March 19 – Seku Amadu, founder of the Fula Massina Empire (b. 1773)
April 10 – Dr. Thomas Sewall, American anatomist (b. 1786)
May 15 – Braulio Carrillo Colina, Costa Rican Head of State (b. 1800)
June 4 – Lasse-Maja, notorious Swedish criminal (b. 1785) June 8 – Andrew Jackson, 7th President of the United States (b. 1767)
July 17 – Charles Grey, 2nd Earl Grey, Prime Minister of the United Kingdom (b. 1764)
July 22 – Heinrich Graf von Bellegarde, Austrian field marshal, statesman (b. 1756)
August 3 – Charlotte Ann Fillebrown Jerauld, American poet and story writer (b. 1820)
August 23 – Rafael Urdaneta, hero of the Latin American War of Independence (b. 1788)
October 12 – Elizabeth Fry, British humanitarian (b. 1780)
October 18 – Jacques Dominique, comte de Cassini, French astronomer (b. 1748)
October 26 – Lady Nairne, Scottish songwriter (b. 1766)
November 17 – Sir Salusbury Pryce Humphreys, British admiral (b. 1778) November 18 – King Aleamotu?a of Tonga (b. 1738)
Jones, Neal T., ed. (1984). . New York; London: Thames and Hudson. A Book of Days for the Literary Year ISBN . 0-500-01332-2
Congress overrides presidential veto for first time. history.house.gov
Penguin Pocket On This Day. Penguin Reference Library. 2006. ISBN . 0-14-102715-0
"The Great Yarmouth Suspension Bridge Disaster - May 2nd 1845" (PDF). Broadland Memories. Archived from the original (PDF) on 2011-07-18 . Retrieved .
The Hutchinson Factfinder. Helicon. 1999. p. 549. ISBN . 1-85986-000-1
^ When the British decided they were going to bring Indians to Trinidad this year, most of the traditional British ship owners did not wish to be involved. The ship was originally named
Cecrops, but upon delivery was renamed to Fath Al Razack. The ship left Calcutta on February 16.
Fox, Stephen (2003). . HarperCollins. Transatlantic: Samuel Cunard, Isambard Brunel, and the Great Atlantic Steamships ISBN . 978-0-06-019595-3
". Great Britain" The Ships List. Archived from the original on May 28, 2010 . Retrieved .
Palmer, Alan; Veronica (1992). The Chronology of British History. London: Century Ltd. pp. 267-268. ISBN . 0-7126-5616-2
". Phytophthora infestans" A Short History of Ireland. BBC . Retrieved .
"E. Clampus Vitus". 2010. Archived from the original on July 22, 2011 . Retrieved 2010.
"Luce Ben Aben School of Arab Embroidery I, Algiers, Algeria". . 1899 World Digital Library . Retrieved .