Answer:The southern states wanted slavery and the north didn't allow it which was the first situation then sectionalism happened between the north and south when new states like Cali wanted to be a free state, disrupting the balance of free and slave states which was the second situation and also south favored states rights and north wanted unity, which was the third situation and basically the south has had enough of it and left the union to be the confederacy. Thus the civil war started.
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