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

...; 1,239 Yanktonai Sioux at Fort Peck agency, in Montana; a considerable number of Yanktonai Sioux at the Standing Rock agency, in North Dakota; and 1,728 Yankton Sioux at the Yankton agency, in South Dakota . For further details of this tribe, see Sioux, or Dakota, Indians.
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Dakota (New Mexico, United States) 12 8 0 0 0 user votes
Dakota (Illinois, United States) 4 0 0 0 0 user votes
Dakota (Minnesota, United States) 4 0 0 0 0 user votes
Dakota (West Virginia, United States) 4 2 0 0 0 user votes
Dakota (Georgia, United States) 2 0 0 0 0 user votes
Dakota (Nebraska, United States) 2 0 0 0 0 user votes
Dakota (Minnesota, United States) 0 0 0 0 0 user votes
Dakota (Wisconsin, 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.