Statistics for occurrence #1 of “Mississippi River” in chapter 4 of Colonel William Preston Johnston, The Life of General Albert Sidney Johnston : His Service in the Armies of the United States, the Republic of Texas, and the Confederate States.:

...States commissioners bought from the deputies of the Winnebagoes, Chippewas, Ottawas, Pottawattamies, Sioux, Menomonees, and Sacs and Foxes, about 8,000,000 acres, extending from Lake Michigan to the Mississippi River . At this treaty, Keokuk and Morgan, with about two hundred Sac warriors, were present and forwarded the negotiation. While such had been the treaty relations with the Sacs and Foxes, two rival...
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