Statistics for occurrence #1 of “Oklahoma” in entry comanche-indians of Harper's Encyclopedia of United States History:

... As late as 1847 their number was estimated at 10,000, with over 2,000 warriors; in 1872, a little over 4,000. They have always been troublesome. In 1899 there were 1,553 at the Kiowa agency in Oklahoma .
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
† Oklahoma (Oklahoma, United States) 816 332 0 0 0 user votes
Oklahoma (Kentucky, United States) 2 2 0 0 0 user votes
Oklahoma (Missouri, United States) 2 2 0 0 0 user votes
Oklahoma (Louisiana, United States) 0 0 0 0 0 user votes
Oklahoma (Mississippi, United States) 0 0 0 0 0 user votes
Oklahoma (Ohio, United States) 0 0 0 0 0 user votes
† Oklahoma (Oklahoma, United States) 0 0 0 0 0 user votes
Oklahoma (Pennsylvania, United States) 0 0 0 0 0 user votes
Oklahoma (Pennsylvania, United States) 0 0 0 0 0 user votes
Oklahoma (Texas, United States) 0 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.