. What issues contributed most to sectionalism in the United States?

Explanation:

There are four categories which can be categorized under all the problems that separated the country mostly during building up to the Crisis:

All these problems contributed to sectionalism in the U.s and brought the nation to the verge of war.

b is the correct answer

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explanation:

an economic reason that the south needed a reconstruction plan is that plantations, factories, and other businesses were destroyed during the war.