What caused many of the former confederate states to run up huge debts under republican-controlled state governments in the late 1860s?

Which of the following statements is true about germany's use of u-boats?

What was the job of the second continental congress

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.