What other sources would help historians understand civilizations in the Americas pre-1600?

Aside from low birthrates and high death rates, what can cause a country’s population to decline

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.

Moral principles is what ? a. appreciation b. tariff c. fiscal d. ethics