What did the groups of Archaic peoples who lived east of the Mississippi River about 6000 years ago have in common with one another?

They all lived in forest environments.

Explanation:

Archaic peoples who lived east of the Mississippi River about 6000 years ago were depended on the forest to survive. Archaic peoples lived in larger groups and used a wide variety of food resources based on seasonal availability. Some of the plant food included roots, seeds, fruits, tubers, and nuts. They also hunted animals like rabbits, elk, antelope, deer, elk, and bison.