Answer:
Many slave owners were allowed to enlist in the war with the promise of their freedom, yet were put back into slavery after the war. In many Northern states, slavery was seen as a right to hold people as property and extremely unjust. The North's economy also did not require slaves, since it was dependent on manufacturing. The South's economy needed slaves. It would be impossible to run a plantation effectively and affordably without the manpower that slaves provided.
In sum, slaves in the North were treated well and with kindness. However, in the South, slaves were disrespected and forced with arduous labor.
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