This area is divided into two of the continent's main geophysical divisions: the Interior Plains and the Ouachita Province representing the Interior Highlands.
The Interior Plains are represented by the Great Plains--in the Oklahoma panhandle and by the Central Lowland--in central Oklahoma. The Ouachita Province is in east central Oklahoma.
The Arkansas River cuts across northeast Oklahoma.
This state is in the part of North America in which English-speakers and Christians are the majority.
The metropolitan area of the state capital, Oklahoma City, has 1.2 million residents.1
The Apache languages, part of the Athapascan group, were spoken in Oklahoma.
Texas Comanches spread the religious use of peyote northward into Oklahoma, then "Indian Territory", where a variety of peoples adopted its sacred use. This gave rise to the Native American Church.
Smallpox and measles devastated indiginous populations in the late 18th century.
In the early 19th century four Muskogean groups and the Cherokee, an Iroquois group, were forcibly removed to Oklahoma from the southeastern United States. There are still about 10,000 Cherokee speakers.
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1. World-gazetteer.com, accessed 11/12/2012. The city proper has about 600 thousand.