A report on Historic regions of the United States

Map showing North American territorial boundaries leading up to the American Revolution and the founding of the United States: British claims are indicated in red and pink, while Spanish claims are in orange and yellow.
Map showing mid 17th century claims and land grant boundaries. Some colonies seen here are: Nova Scotia (NSc), Territory of Sagadahock (TS), First Province of Maine (Me), New Hampshire (NH), Plymouth (PC), Massachusetts Bay (MBC), New Netherland (NN), New Sweden (NSw), and Lord Baltimore's Land (Md; Maryland)
New World settlements of The Netherlands, collectively called New Netherland
The Massachusetts Bay Colony
French settlements and forts in the so-called Illinois Country, 1763, which encompassed parts of the modern day states of Illinois, Missouri, Indiana and Kentucky)
A 1775 map of the German Coast, a historical region of present-day Louisiana located above New Orleans on the eastern bank of the Mississippi River
Vandalia was the name of a proposed British colony located south of the Ohio River, primarily in what is now the U.S. states of West Virginia and eastern Kentucky
A proposal for the creation of Westsylvania was largely deterred by the Revolutionary War
National Atlas map of United States territorial acquisitions
Seward's Folly. The controversial purchase of Alaska from Russia in 1867 turned out to be a great deal for the U.S. when the area proved to contain a treasure trove of natural resources.
The Oregon Country. The dispute over Oregon, between Britain and the U.S., led to an uneasy, parallel governing of the territory for almost 30 years.
Progression of the Indian Territory separation from the Arkansaw Territory, 1819–1836
Indiana lands acquired through treaties
The first state cessions. The 13 original states ceded their western claims to the federal government, allowing for the creation of the country's first western territories and states.
The Northwest Territory was a large and (at times) ill-defined territory ceded by Great Britain to the U.S. at the end of the Revolutionary War. British troops still occupied parts of the area well past 1800.
United States territorial expansion since 1803, maps by William R. Shepherd (1923)
Census Bureau map depicting territorial acquisitions and effective dates of statehood
The Ohio Country, indicating battle sites between settlers and Native American Tribes, 1775–1794
Selected tract purchases of western New York State
Map of the Ohio Lands
Oklahoma Territory and Indian Territory, along with No Man's Land (also known as the Oklahoma Panhandle). The division of the two territories is shown with a heavy purple line. Together, these three areas would become the State of Oklahoma in 1907.
Pennsylvania land purchases from Native Americans
Post-Civil War military districts were set up to aid in the repatriation process of the southern states during Reconstruction.
The Panama Canal Zone was once a territory of the United States
The boundaries of the State of Deseret, as proposed in 1849
Animated map of secession and repatriation of the Confederacy, 1860–1870
The proposed State of Superior. The red areas show the counties of the Upper Peninsula that are generally accepted as being part of the proposed state. The pink areas show the counties of the "expanded" proposal.
The failed State of Lincoln, with its proposed 1868 boundaries
The Philippines was a commonwealth of the United States, 1935–1946
Worldwide location of current U.S. insular areas:
The Commonwealth of Puerto Rico

The territory of the United States and its overseas possessions has evolved over time, from the colonial era to the present day.

- Historic regions of the United States
Map showing North American territorial boundaries leading up to the American Revolution and the founding of the United States: British claims are indicated in red and pink, while Spanish claims are in orange and yellow.

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Indiana Territory

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A map of the Indiana Territory in 1812 displaying notable places and battles in the War of 1812
William Henry Harrison, the 1st Governor of Indiana Territory from 1801 to 1812, and the 9th President of the United States
Anthony Wayne negotiating with the Northwestern Indian Confederacy in the Treaty of Greenville
Grouseland, the home of Governor William Henry Harrison
At Vincennes in 1810, Tecumseh lost his temper when William Henry Harrison refused to rescind the Treaty of Fort Wayne.
Congressman Jonathan Jennings, delegate of the Indiana Territory
The old capitol building in Corydon

The Indiana Territory was created by a congressional act that President John Adams signed into law on May 7, 1800, to form an organized incorporated territory of the United States that existed from July 4, 1800, to December 11, 1816, when the remaining southeastern portion of the territory was admitted to the Union as the state of Indiana.

Louisiana Territory

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Map of the Territory of Louisiana
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The Territory of Louisiana or Louisiana Territory was an organized incorporated territory of the United States that existed from July 4, 1805, until June 4, 1812, when it was renamed the Missouri Territory.

Missouri Territory

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Map of the Territory of Missouri in 1812
Missouri Territory, formerly Louisiana, 1814 map

The Territory of Missouri was an organized incorporated territory of the United States that existed from June 4, 1812, until August 10, 1821.

The Colorado Territory as drawn in 1860 from the Utah, Nebraska, Kansas, and New Mexico Territories. Colorado appears to have a rectangular border at this scale, but there are in fact some slight deviations from a straight line along its southern border.

Colorado Territory

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The Colorado Territory as drawn in 1860 from the Utah, Nebraska, Kansas, and New Mexico Territories. Colorado appears to have a rectangular border at this scale, but there are in fact some slight deviations from a straight line along its southern border.
The Colorado Territory as drawn in 1860 from the Utah, Nebraska, Kansas, and New Mexico Territories. Colorado appears to have a rectangular border at this scale, but there are in fact some slight deviations from a straight line along its southern border.

The Territory of Colorado was an organized incorporated territory of the United States that existed from February 28, 1861, until August 1, 1876, when it was admitted to the Union as the State of Colorado.

Nebraska Territory

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$1 City of Omaha 1857 uniface banknote. The note is signed by Jesse Lowe in his function as Mayor of Omaha City. It was issued as scrip in 1857 to help fund the erection of the territorial capitol building at Omaha.
The front page of the December 6, 1854 issue of the Nebraska Palladium, the first newspaper to be published in the Nebraska Territory
The front page of the May 4, 1857 issue of the Nebraska Advertiser founded by Robert Wilkinson Furnas, in Brownville, Nebraska Territory
Site No. JF00-072: The Nebraska–Kansas state line at the intersection of Nebraska counties Thayer and Jefferson and Kansas counties Washington and Republic
Map of the territory of Nebraska and seal of the Nebraska Territory

The Territory of Nebraska was an organized incorporated territory of the United States that existed from May 30, 1854, until March 1, 1867, when the final extent of the territory was admitted to the Union as the State of Nebraska.

New Mexico Territory

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Map of the later Arizona and New Mexico Territories, split from the original New Mexico Territory of 1851, showing existing counties
Proposed boundaries for the earlier federal State of New Mexico, 1850
Map of the later Arizona and New Mexico Territories, split from the original New Mexico Territory of 1851, showing existing counties
New Mexico Territory, 1852
The Gadsden Purchase, 1853

The Territory of New Mexico was an organized incorporated territory of the United States from September 9, 1850, until January 6, 1912.

Kansas Territory

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Map of the United States in 1812
Site No. JF00-072: The Nebraska–Kansas state line at the intersection of Nebraska counties Thayer and Jefferson and Kansas counties Washington and Republic
1855 first edition of Colton's map of the Nebraska and Kansas Territories
Territorial changes of Kansas

The Territory of Kansas was an organized incorporated territory of the United States that existed from May 30, 1854, until January 29, 1861, when the eastern portion of the territory was admitted to the Union as the free state of Kansas.

Utah Territory

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The Utah Territory upon its creation, with modern state boundaries shown for reference
The evolution of the Utah Territory from its creation by Congress in 1850 to 1896, when statehood was granted
The Utah Territory upon its creation, with modern state boundaries shown for reference

The Territory of Utah was an organized incorporated territory of the United States that existed from September 9, 1850, until January 4, 1896, when the final extent of the territory was admitted to the Union as the State of Utah, the 45th state.

Washington Territory

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The Washington Territory (green) and the Oregon Territory (blue) in 1853
The Washington Territory (green) and the State of Oregon in 1859
Portions ceded to the Nebraska and Idaho Territories in 1861 and 1863

The Territory of Washington was an organized incorporated territory of the United States that existed from March 2, 1853, until November 11, 1889, when the territory was admitted to the Union as the State of Washington.

Idaho Territory

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Seal of the Idaho Territory, 1863–1866
Entrance to the Old Penitentiary
Old Washington Territory{{mdash}}and the portions ceded to Nebraska Territory on March 2, 1861, and to Idaho Territory in 1863.
The Idaho Territory in 1863
Areas ceded to the Montana and Dakota Territories in 1864
The Idaho, Montana, and Wyoming Territories in 1868

The Territory of Idaho was an organized incorporated territory of the United States that existed from March 3, 1863, until July 3, 1890, when the final extent of the territory was admitted to the Union as Idaho.