What important role do rivers play in the southeast

What was the effect of peace in europe after 1815

Which would make the best heading for this list of notes about the migration of african-americans during the reconstruction era?

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.