Answer :
The early mound-building tribes flourish in the mississippi and ohio river valleys.
The required details about mound-building tribes is mentioned in below paragraph.
The Adena, Hopewell, and Fort Ancient Native American societies constructed mounds and enclosures in the Ohio River Valley between 500 B.C. and 1650 A.D. for burial, religious, and occasionally defense purposes. For dramatic effect, they frequently constructed their mounds on or near tall cliffs or bluffs, as well as in rich river valleys. There were once so many mounds in the Ohio River Valley and its surroundings due to this widespread practice that Henry Brackenridge, who was traveling through Ohio and the Mississippi Valley in 1811, could write: There is barely a growing town or farm in a suitable location where some of these remnants might not be discovered. Sadly, recent urban growth has demolished the mounds, leaving only a little remnant today.
Thus it flourish in the mississippi and ohio river valleys.
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