Give an example of how ethnologists helped archaeologists determine how something was used.

here you go :)

Explanation:

In many sites in the Southwest, prehistoric sites often contained large underground circular rooms. Archaeologists did not know how the rooms were used. By observing modern use of kivas, ethnologists and archaeologists could understand the religious significance of the underground circular rooms.

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