Although it seemed quite important in 1788,what amendment barring the quartering of soldiers in private homes.is outdated today

Region C, Region D

The Mound Builders were inhabitants of North America who built various styles of mounds mostly for religious and burial purposes, 5000 years ago. Most lived in the regions of the Great Lakes, the Ohio River Valley, and the Mississippi River valley,

Based on the map presented, The Mound Builders primarily lived in regions C and D where Mississippi and Ohio Valley are located.