How did the states’ rights doctrine contribute to sectionalism?

answer:

A prominent influence on sectionalism was the states' rights doctrine—a governmental policy stating that the Constitution protects the rights of individual states from federal government interference. ... The amendment, ratified in 1791, emphasized the limited nature of the powers given to the federal government.

Explanation:

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while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.