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 of the Arizona and New Mexico Territories, showing existing counties
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
The Gadsden Purchase, 1853
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 Arizona (also known as Arizona Territory) was a territory of the United States that existed from February 24, 1863, until February 14, 1912, when the remaining extent of the territory was admitted to the Union as the state of Arizona.

- Arizona Territory

Territory of New Mexico (1850–1912) preceded by Nuevo Mexico (the southern part was known as the Arizona Territory (1861–1864) by the Confederate States of America); split into the Arizona Territory and the State of New Mexico.

- Historic regions of the United States

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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.

On February 24, 1863, during the Civil War, Congress passed the "Arizona Organic Act", which split off the western portion of the 12-year-old New Mexico Territory, establishing the new Arizona Territory, where it abolished slavery.