Which of these activities had the greatest economic impact on the southeastern United States between 1818-1860? A) shipbuilding
B) cotton farming
C) logging
D) coal mining

the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

hope this .

plz give me brainliest!