Missouri Territory
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Missouri Territory
Territory of Missouri
Organized incorporated territory of the United States
Flag of Missouri
United States 1812-06-1816.png
Map of the Territory of Missouri in 1812
CapitalSt. Louis
 o TypeOrganized incorporated territory
o Renaming of Louisiana Territory
June 4 1812
March 2, 1819
Missouri statehood
August 10 1821

The Territory of Missouri was an organized incorporated territory of the United States that existed from June 4, 1812 until August 10, 1821. In 1819, the Territory of Arkansas was created from a portion of its southern area. In 1821, a southeastern portion of the territory was admitted to the Union as the State of Missouri, and the rest became unorganized territory for several years.


The Missouri Territory was originally known as the Louisiana Territory and was renamed by the U.S. Congress on June 4, 1812, to avoid confusion with the new state of Louisiana, which had been admitted to the Union on April 30, 1812.

On October 1, 1812, Governor Clark organized the five administrative districts of the former Louisiana Territory into counties, which later became the first five counties of the state of Missouri.

The Anglo-American Convention of 1818 established the northern boundary of the Missouri Territory with the British territory of Rupert's Land at the 49th parallel north. This gave the Missouri Territory the Red River Valley south of the 49th parallel and gave Rupert's Land the slice of Missouri River Valley north of 49th parallel. The Adams-Onís Treaty of 1819 established the southern and western boundaries of the territory with the Spanish territories of Tejas and Santa Fe de Nuevo México. The United States surrendered a significant portion of the Missouri Territory to Spain in exchange for Spanish Florida. The Convention of 1818 and the Adams-Onís Treaty would be the last significant losses of United States territory from the contiguous United States, although the cession of lands north of the 49th parallel would turn out to be the only permanent cession of U.S. territory (the territories ceded to Spain would be re-taken by the U.S. following the Texas annexation and the Mexican-American War).

On March 2, 1819, all of the Missouri Territory south of the parallel 36°30' north, except the Missouri Bootheel between the Mississippi River and the Saint Francis River north of the 36th parallel north, was designated the new Territory of Arkansaw. (The spelling of Arkansaw would be changed a few years later, although the proper pronunciation of the name would be debated until 1881.) The southeastern portion of the Missouri Territory was admitted to the Union as the State of Missouri on August 10, 1821.

St. Louis was the capital of the Missouri Territory.[2]

The remaining portion of the territory, consisting of the present states of Iowa, Nebraska, and the Dakotas, most of Kansas, Wyoming, and Montana, and parts of Colorado, Minnesota and New Mexico, effectively became an unorganized territory after Missouri became a state. In 1834, the portion east of the Missouri River was attached to the Michigan Territory. Over time, various territories were created in whole or in part from its remaining area: Iowa (1838), Minnesota (1849), Kansas and Nebraska (both 1854), Colorado and Dakota (both 1861), Idaho (1863), Montana (1864), and Wyoming (1868).

See also


  1. ^ Forstall, Richard L. (ed.). Population of the States and Counties of the United States: 1790-1990 (PDF) (Report). United States Census Bureau. p. 4. Retrieved 2020.
  2. ^ "How the City of Jefferson became the State Capital". Archived from the original on 7 February 2005. Retrieved 2011.

External links

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.



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