High Quality Content by WIKIPEDIA articles! Oklahoma Territory's history began with the Indian Intercourse Act of 1834 when the United States Congress set aside land for Native Americans. At the time, the land was unorganized territory that consisted of all the federal land "west of the Mississippi and not within the states of Missouri and Louisiana, or the territory of Arkansas..." By 1856, the territory had been reduced to the modern day borders of the State of Oklahoma. These lands quickly became known as Indian Territory. Up until this point, the land had been exclusively used by Native Americans. However, in 1866, shortly after the American Civil War, the federal government forced many of the tribes in Indian Territory into making concessions. Washington accused them of abrogating the standing treaties by joining the Confederacy. As a result some 2,000,000 acres (8,100 km2) of land in the center of the Indian Nation Territory were ceded to the United States.

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