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Evidence American Bottom Mississippian interactions with cultures outside the American Bottom (directed trade?) - map showing the provenance of some raw materials used by American Bottom Mississippians, and the locations of major Mississippian sites in the midwest.
Kelly, John E. 1991. Cahokia and its Role as a Gateway Center in Interregional Exchange. In Cahokia and the Hinterlands, edited by T. E. Emerson and R. B. Lewis, pp 61-80. University of Illinois Press. Fig. 4.2, p.66
Image courtesy of the Board of Trustees of the University of Illinois.