Where did early mound-building tribes flourish?

Early mound-building tribes flourish "In the Mississippi and Ohio River Valleys".

Explanation:

"Mound Builders" is a collective name for number of North American inhabitants for a period of 5000 years and comprised from Archaic's period pre-Columbian cultures, Woodland's period Adena, Calusa and Hopewell cultures, Mississippian period cultural people from 3599 BCE to 16th century CE resided in Ohio & Mississippi River Valley.

The Mound Builders were categorized with different classes of society termed as the Nobles, the Stars, the Honored Men and the Honored Women and the lower class.The Mound Builders use to pay homage to the sun and centered their religion served by shaven priests, a shaman, and leaders of the village around a temple.

what are local authorities doing to fix the problem

explanation: