Help me out please!! it should be easy i would think

Which statement best describes a major advantage of a confederal system of government over a unitary system

The 14th amendment overruled the supreme court case of dred scott vs. sandford. the landmark supreme court case determined which of the following points? a. slaves could not be citizens b. non-landowners could not be citizens c. blacks could not be citizens d. all persons born or naturalized in the united states vary differently in citizen status.

Why is it important that dr. luther king jr. use non-violent protest to create social change?