What region of the United States did Mound Builders reside in?

Eastern United States

Explanation:

Mound Builders, in North American archaeology, the name given to those people who built mounds in a large area from the Great Lakes to the Gulf of Mexico and from the Mississippi River to the Appalachian Mts. The greatest concentrations of mounds are found in the Mississippi and Ohio valleys.

c) they were beaten and fired from their jobs.

the first two years of american revolution was not very encouraging for the patriots since the british were far superior in sea power, arms and troops.