Why did the tariff of abominations cause a crisis

What is zinn's approach to the study of history? what does he suggest occurs when history is told is the story of human progress?

How did the invention of the cotton gin affect slave labor in the united states? a. there was a forced migration of slaves from the south to the north. b. slave-owning cotton planters were gradually forced to sell their plantations. c. more slaves were purchased to work on cotton plantations in the south. d. the reduced need for labor on cotton plantations led to a decline in slavery. e. slaves were moved from cotton plantations to sugar plantations.

The economy shifted from to industrial during the first industrial revolution