Answer:
When the U.S. Supreme Court ruled in the Dred Scott decision that the Missouri Compromise's prohibition of slavery in territories was unconstitutional, an increasingly diverse body of opponents of slavery rallied around the Republican Party.
Explanation:
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The Southern States were unhappy with the changes in slavery and how they weren’t as free, they cut themselves off from the northern states, then calling themselves the confederate states.
The answer is C.
A third party is a political party that is created as an alternative to the major parties in a two party system.
A good example is the US Green Party. The Green Party is an alternative to the Democratic and Republican Party.
Hope this helps!
<span>see how this was not a good way to run an empire.</span>