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Missouri History

www.sikeston.k12.mo.us/SKELSO/Social%20Studies/Missouri%20History/...

Some historical cities, important in Missouri's development are St. Joseph ...
William Clark was the first governor of the new Missouri Territory. By 1818 Missouri ...

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The Territory of Missouri

was an organized incorporated territory of the United States 

that existed from June 4, 1812 until August 10, 1821,
when the southeastern portion of the territory was admitted to the Union as the State of Missouri.

Originally the state's western border was a straight line, defined as the meridian passing through the Kawsmouth,^[37] the point where the Kansas River enters the Missouri River. The river has moved since this designation. This line is known as the Osage Boundary.^[38] 

In 1835 the Platte Purchase was added to the northwest corner of the state after purchase of the land from the native tribes, making the Missouri River the border north of the Kansas River. This addition increased the land area of what was already the largest state in the Union at the time (about 66,500 square miles (172,000 km²) to Virginia's 65,000 square miles (which then included West Virginia).^[39]

More specifically, Indian Territory 

was an Unorganized territory whose general borders were initially set by the Indian Intercourse Act of 1834, and was the successor to Missouri Territory after Missouri received statehood.

The borders of Indian Territory were systematically reduced in size as various Organic Acts were passed by the US Congress creating anIncorporated territory or Territory of the United States that would eventually be admitted to the union as a State of the United States.

Several tribes, (Seneca, Osage and Pottawatomi, etc.) were relocated more than once as Indian Territory shrank in size. As tribes were relocated, some received land grants in exchange for their former lands, and others (such as Osage, Seminole, and Chickasaw) ultimately purchased their land, usually receiving Fee simple title to the land.

The Oklahoma Enabling Act 

specified that Oklahoma Territory and Indian Territory

would be admitted as a single state of Oklahoma, which occurred in 1907.

At that time, Indian Territory ceased to exist