First response gets brainliest
how did the civil war had to do with “national supremacy”?

the unions victory firmly established national supremacy and put to rest he most radical interpretations of state sovereignty. After the was congress passed 14th amendment. Civil war expanded constitutional powers for national government.

Explanation:

one of the major compromises in the constitutional convention was between the small states and big states. the small states wanted each state to have the same number of representatives in congress. the big states wanted representation based on population.

the answer is a, salt plain