Why was the Roman Republic plagued by civil war throughout the last century B. C.E.?

The declaration of independence gave the americans concrete reasons for the 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.

There are no written records of the first migration of humans to the americas? true or false