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Missouri, Illinois, and Kentucky.
Lake Erie
Kentucky, Indiana, Illinois
The confluence of the Ohio and Mississippi is essentially the Missouri-Illinois-Kentucky "triple point".
Indiana, Ohio, and Illinois
The Missouri river joins the Mississippi at St. Louis.
At Cairo, Illinois, the Ohio joins the Mississippi. The three states that have borders there are Illinois (to the NE), Kentucky (to the SE) and Missouri (to the W).
Missouri, Kentucky, and Illinois
The Missouri River joins the Mississippi very near St Louis.
Mississippi River
The answer is tennesee
The Missouri joins the Mississippi near St. Louis, Missouri.