The 1850s was a decade that ran from January 1, 1850, to December 31, 1859. The 1850s was a very turbulent decade, as wars such as the Crimean War, shifted and shook European politics, as well as the expansion of colonization towards the Far East, which also sparked conflicts like the Second Opium War. At the mean time, The United States saw its peak on mass migration to the American West, that particularly made the nation experience an economic boom, as well as a rapidly increasing population.
- Crimean War (1854–56) fought between Imperial Russia and an alliance consisting of the United Kingdom of Great Britain and Ireland, the Second French Empire, the Kingdom of Sardinia and the Ottoman Empire. The majority of the conflict takes place around Crimea, on the northern coasts of the Black Sea.
- On 8 October 1856, the Second Opium War between several western powers and China begins with the Arrow Incident on the Pearl River.
- Second War of Italian Independence (1859), also known as Franco-Austrian War, or Austro-Sardinian War.
- The Indian Mutiny: revolt against British colonial rule in India
- Bleeding Kansas (1854–59): battles erupt in Kansas Territory between proslavery and "Free-State" settlers, directly precipitating the American Civil War.
- Reform War (1857-61) in Mexico
- Taiping Rebellion (1851–64) in Qing China. (Southeastern China)
- Nian Rebellion (1853–68) in Qing China. (Northern China)
- Miao Rebellion (1854–73) in Qing China. (Guizhou Province)
- Red Turban Rebellion (1854–1856) in Qing China. (Guangdong Province)
- Punti-Hakka Clan Wars (1855-67) in Qing China. (Guangdong Province)
- Panthay Rebellion (1856-73) in Qing China. (Yunnan Province)
Prominent political events
- Moldavia and Wallachia are unified and form Romania.
- Gideon T. Stewart attempts to create a Prohibition Party.
- Dissolution of the Mughal Empire by the British.
Assassinations and attempts
Prominent assassinations, targeted killings, and assassination attempts include:
- Eight were killed and 142 wounded in Paris in a failed assassination attempt on Napoleon III, Emperor of the French (1858).
Science, technologies and Institutions
- Charles Darwin publishes The Origin of Species, putting forward the theory of evolution by natural selection in November 1859.
- Epidemiology begins when John Snow traces the source of an outbreak of cholera in London to a contaminated water pump.
- Discovery of Neanderthal fossils in Neanderthal, Germany
- Solar flares discovered by Richard Christopher Carrington
- University of Sydney established at 1850
- Distinction between coats and jackets begins to blur
- Production of steel revolutionized by invention of the Bessemer process
- Benjamin Silliman fractionates petroleum by distillation for the first time
- First transpacific telegraph cable laid
- First safety elevator installed by Elisha Otis
- Railroads begin to supplant canals in the United States as a primary means of transporting goods.
- First commercially successful sewing machine made by Isaac Singer
- The word girlfriend first appears in writing in 1855.
- The word boyfriend first appears in writing in 1856.
- Charles Dickens publishes Bleak House, Hard Times, Little Dorrit and A Tale of Two Cities
- Nathaniel Hawthorne publishes The Scarlet Letter in 1850
- Herman Melville publishes Bartleby, the Scrivener in 1853
Note: Names of country leaders shown below in bold face have remained in power continuously throughout the entirety of the decade
- Беларуская (тарашкевіца)
- Emiliàn e rumagnòl
- Fiji Hindi
- Bahasa Indonesia
- Basa Jawa
- Bahasa Melayu
- Runa Simi
- Саха тыла
- Sesotho sa Leboa
- Simple English
- Српски / srpski
- Srpskohrvatski / српскохрватски
- Basa Sunda
- Tiếng Việt