What is one benefit to the constitution giving powers to state governments?

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The major impact third parties have on presidential elections has been to.. a. encourage larger vote turnout b. recruiter leader from the democratic and republican party to run for president c. generate increased party identification among the electorate d. developing issues that are later adopted by the major political parties e. drawn off of votes from the major parties to throw election into the house representatives

What was the most explosive issue facing the united states prior to the start of the civil war?