<human>:  I have a question about the treatment of Slaves in the American Civil War. Why did the North and South fight over this issue?
<bot>: The North and South fought over the issue of slavery because the North wanted to abolish slavery, and the South wanted to keep it. The North wanted to end slavery because they believed that slavery was morally wrong, and the South wanted to keep it because they believed that slavery was a necessary part of their economy.