Who were the red guards? what did the red guards do to enforce the cultural revolution?

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.

What emperor was given credit for having the aqueducts built

How did the environments in north america affect the development of america indian cultures in the period just before europeans arrived