A report on Illinois Territory and 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.

Between 1818 and 1833, after Illinois became a state, the unincorporated land from the territory, plus a handful of other townships, was made part of the Michigan Territory.

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

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

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

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 Territory of Illinois was an organized incorporated territory of the United States that existed from March 1, 1809, until December 3, 1818, when the southern portion of the territory was admitted to the Union as the State of Illinois.

- Illinois Territory

Territory of Illinois (1809–1818) split into the State of Illinois and additions to the Michigan Territory.

- Historic regions of the United States

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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 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.

The territory originally contained approximately 259,824 mi2 of land, but its size was decreased when it was subdivided to create the Michigan Territory (1805) and the Illinois Territory (1809).