Why the europeans in the caribbean felt the need to bring in enslaved africans as laborers?

The battle of fort wagner is most important for which

Two of these describe "federalism." (choose two answers) select one or more: a. the national government absolutely controls all state governments. b. power is shared by the national and state governments. c. state governments exercise absolute power over the national government. d. it is a compromise meant to eliminate the disadvantages of a "unitary" and a "confederate" system.

Which item in the list are methods a political party might influence public opinion