Since the development of industrial society, more and more jobs were replaced by simple machinery and it focus the spread of job availability to only several areas in united States.This caused the decreasing rate of wages or even employment within the u.s society, and the economic pressure eventually lead to class violence
The north's economy was based predominantly on manufacturing,shipping, and other factory businesses.
In the south, however, most of the economy was agricultural, requiring many farmworkers.
China is the right answer
