The Cahokia site near East St. Louis, Illinois, was a gateway on the northwestern frontier of the Mississippian heartland. Its exact relationship to other Middle Mississippi cultures and to cultures of the Plains and Upper Great Lakes ar ea is still not fully under stood. It is clear, nonetheless, that these relationships, when more completely known, will prove to be :inuch more complicated than any suggested in current literature.
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Robert L. Hall (1967) studied this question.