What did the burial artifacts found in the harlan mound site prove? a. mound builders lived in oklahoma 9,000 years ago. b. mound builders invented clovis spear points. c. mound builders had a very extensive trade network. d. mound builders hunted megafauna.

The answer is: c. Mound Builders had a very extensive trade network

The artifacts that found in the burial have several similarities with cultures that located from other places outside their territory (some of them are very similar to those found in south america and Europe). From this, we can conclude that their culture interact with many different culture through extensive trade networks.

google it

explanation:

they bring people together to achieve control of the government

basically choosinng what sets in   congress and presdicny this is to keepthe antion hole and so it can last because wiht out authority it wouldnt last a week