Choose the definition for environment. A. The art of making maps.

B. The study of how humans interact with each other and with the world around them.

C. The study of the Earth's surface.

D. The physical world and its natural processes.

answer; in the united states the plains include the great plains of the west and the tail grass prairie to the south of the great lakes extending east to the appalachian plateau

i think the answer to your question is: settlement of the interior and economic growth. ( ^_^)／