A report on Utah Territory, New Mexico Territory, Colorado Territory and Historic regions of the United States

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.
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.
The Utah Territory upon its creation, with modern state boundaries shown for reference
Map of the later Arizona and New Mexico Territories, split from the original New Mexico Territory of 1851, showing existing counties
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.
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)
The evolution of the Utah Territory from its creation by Congress in 1850 to 1896, when statehood was granted
Proposed boundaries for the earlier federal State of New Mexico, 1850
New World settlements of The Netherlands, collectively called New Netherland
The Utah Territory upon its creation, with modern state boundaries shown for reference
Map of the later Arizona and New Mexico Territories, split from the original New Mexico Territory of 1851, showing existing counties
The Massachusetts Bay Colony
New Mexico Territory, 1852
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)
The Gadsden Purchase, 1853
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 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.

- Utah Territory

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

- New Mexico Territory

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.

- Colorado Territory

The territory was organized by an Organic Act of Congress in 1850, on the same day that the State of California was admitted to the Union and the New Mexico Territory was added for the southern portion of the former Mexican land.

- Utah Territory

The request was approved at the same time that the Utah Territory was created to the north.

- New Mexico Territory

East of the Continental Divide, the new territory included the western portion of the Kansas Territory, as well as some of the southwestern Nebraska Territory, and a small parcel of the northeastern New Mexico Territory.

- Colorado Territory

On the western side of the divide, the territory included much of the eastern Utah Territory, all of which was strongly controlled by the Ute and Shoshoni.

- Colorado Territory

In 1861 a large portion of the eastern area of the territory was reorganized as part of the newly created Colorado Territory.

- Utah Territory

The Colorado Territory was established by the "Colorado Organic Act" on February 28, 1861, with the same boundaries that would ultimately constitute the State of Colorado.

- New Mexico 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

Territory of Utah (1850–1896) preceded by Alta California and the unrecognized State of Deseret; split into the State of Utah, the Nevada Territory, additions to the Colorado Territory and additions to the Wyoming Territory.

- Historic regions of the United States

Territory of Colorado (1861–1876) preceded by parts of the territories of Kansas, Utah, New Mexico and Nebraska; became the State of Colorado. (See also Jefferson Territory.)

- Historic regions of the United States

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