The four Causes of the Civil Wars Slavery, One Union vs state's rights, The growing differences between the North and the South and The election of President Lincoln.
I would say Communism played a big role in it too.
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A: He wanted to quickly end the war in the Pacific without invading.
Germany had surrender by this point in the war, and it was only Japan left, they didn't want to cause more casualties by a full-scale invasion, so they wanted to use the bombs in hopes to end the war for good.
They were not entitled to freedom in the North, because there was a law stating that if caught, they were sent back to their slave owners in the south.