1800s
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{{dablink|This article is about the decade 1800CE-1809CE. For the century CE, see 19th century.}}{{Decadebox|180}}
==Events and trends==
===Technology===
* Invention of the [[Jacquard loom]] in 1801.
* [[Ultraviolet|Ultraviolet radiation]] is discovered by [[Johann Wilhelm Ritter]] in 1801.
* [[Flag semaphore]] is gradually adopted by various [[navy|navies]] of the world.
* [[Morphine]] is isolated from [[opium]] for the first time in 1804.
* [[Nicolas François Appert]] develops a method to preserve food by means of [[canning]].
* [[John Dalton]] publishes his atomic theory 1803.
===Astronomy===
* The first known [[asteroids]] are discovered in this decade:
** [[Ceres (dwarf planet)|Ceres]] ([[1801-01-02]]). Ceres is reclassified as a [[dwarf planet]] in 2006.
** [[2 Pallas|Pallas]] ([[1802-03-28]])
** [[3 Juno|Juno]] ([[1804-09-01]])
** [[4 Vesta|Vesta]] ([[1807-03-29]])
===War, peace and politics===
* End of the [[Quasi-War]] (1800).
* The [[First Barbary War]] (1801–1805) is fought between the [[United States]] and the [[Barbary States]] of [[North Africa]].
* The [[Kingdom of Great Britain]] and the [[Kingdom of Ireland]] merge into the [[United Kingdom of Great Britain and Ireland]] in 1801.
* In 1803, the US acquired the [[Louisiana Purchase|Louisiana Territories]] from [[France]].
* The [[Second Anglo-Maratha War]] (1803-1805) is fought between the [[Peshwa|Maratha Peshwa]] on one side and minor chieftains of the Maratha Confederacy [[Sindhia]],[[Bhonsle]] and [[Holkar]] on the other resulting in a crushing defeat of the rebel chieftains and the breakup of the Maratha confederacy.
* [[Haiti]] gains [[independence]] from France on [[1804-01-01]], becoming the first [[Black people|black]] [[republic]].
* The [[Fulani War]] (1804–1810) is fought in present day [[Nigeria]] and [[Cameroon]].
* The [[First Serbian Uprising]] (1804−1813) marks the first time in 300 years [[Serbia]] perceives itself an independent state.
* End of the [[French Revolutionary Wars]] (1792-1802).
* Beginning of the [[Napoleonic Wars]] (1803–1815).
* Beginning of the [[Russo-Turkish War (1806–1812)]] between [[Russia]] and the [[Ottoman Empire]].
==World leaders==
* Emperor [[Napoleon I of France|Napoleon I]] ([[First French Empire]])
* Emperor [[Francis II, Holy Roman Emperor|Francis II]] ([[Holy Roman Empire]])
* [[Frederick William III of Prussia]] ([[Prussia]])
* [[Pope Pius VII]]
* [[Tsar]] [[Paul I of Russia|Paul I]] ([[Russia]])
* Tsar [[Alexander I of Russia|Alexander I]] (Russia)
* King [[Charles IV of Spain|Charles IV]] ([[Spain]])
* King [[Gustavus IV Adolphus]] ([[Sweden]])
* King [[Charles XIII]] ([[Sweden]])
* King [[George III of the United Kingdom|George III]], ([[United Kingdom of Great Britain and Ireland]])
* [[President of the United States|President]] [[John Adams]] ([[United States]])
* President [[Thomas Jefferson]] (United States)
* [[Fath Ali Shah]] of [[Qajar dynasty]] ([[Persia]])
* [[Jiaqing Emperor]] of [[China]] ([[Qing Dynasty]])
* [[Mughal Empire]]
* [[Shah Alam II]] 1759-1806
* [[Akbar II]] 1806-1837
* [[Baji Rao II]]([[Peshwa]] of the [[Maratha Empire|Marathas]])
* Maharaja [[Ranjit Singh]] ([[Sikh Empire|Sikh Empire, Punjab]]) 1801-1839
[[Category:1800s| ]]
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[[ar:عقد 1800]]
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[[ca:Dècada del 1800]]
[[cv:1800-мĕш çулсем]]
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[[ko:1800년대]]
[[hr:1800-ih]]
[[io:1800a yari]]
[[id:1800-an]]
[[os:1800-тæ]]
[[is:1801–1810]]
[[it:Anni 1800]]
[[jv:1800-an]]
[[ka:1800-იანები]]
[[kk:1800 жж.]]
[[la:Decennium 181]]
[[lt:XIX amžiaus 1-as dešimtmetis]]
[[hu:1800-as évek]]
[[mr:इ.स.चे १८०० चे दशक]]
[[ms:1800-an]]
[[nl:1800-1809]]
[[ja:1800年代]]
[[no:1800-årene]]
[[nrm:Annaées 1800]]
[[uz:1800-lar]]
[[pl:Lata 1800-1809]]
[[pt:Década de 1800]]
[[ksh:1800-er Joohre]]
[[ro:Anii 1800]]
[[ru:1800-е]]
[[se:1800-lohku]]
[[sq:Vitet 1800]]
[[scn:1800ini]]
[[simple:1800s]]
[[sk:0. roky 19. storočia]]
[[sl:1800.]]
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[[fi:1800-vuosikymmen]]
[[sv:1800-talet (decennium)]]
[[ta:1800கள்]]
[[tt:1800. yıllar]]
[[uk:1800-ті]]
[[wa:Anêyes 1800]]
[[zh-yue:1800年代]]
[[zh:1800年代]]