What did the mound builders use for money?

Answer 1

They were used for storing goods in. So the other attackers couldn't steal there goods.

They sometimed put thier leaders in there or even lived there.

Answer 2

The mound-builders used the river for transportation. They built a series of interlocking canals. Many archaeologists believe that the artificial rivers in the southern US were handed down by the mound-builders.

Answer 3

smaller mounds lol