Explain why the north had such a large economic stake in avoiding a civil war with the south

The north was industrizing there was more oppertunity like fishing farming and many other jobs while in the south there was only farming and farming for slaves.

Explanation: forgive my spelling. plz like

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

the answer is prolly b