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Answer:
Post more all it says is the article
Here is link for you where I found it for you xD.
https://answers.yahoo.com/question/index?qid=20120208180815AA71N2F
If I'm not mistaken I think The Hopewell people eventually spread westward to the Illinois River Valley and into Tennessee, where the Mississippian period began some time after 800 C.E. Cahokia was built near where the Missouri, Ohio, and Illinois rivers empty into the Mississippi.