Because they thought it was wrong thing to have slaves.
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They were having disagreements on slavery. The North (Union) was against slavery and were the free states. The South (Confederate) was for slavery and were slave states.
If its the end of slavery then all of the states were free
15 states were black people free from slavery
15 out of 34 states were slave states.
Slavery has had a great impact on the United States. Originally slavery was used as free labor for many farmers.