Were there slave holders in the north?
Not usually. if there were, they worked in secret. nobody knew that they had a slave, and if they did have one, they were more than likely going to move to the south. it was highly frowned upon if someone found out that you had a slave. You could even be sent to jail for it. Then the slave would be freed and given land and a house. so the slave got it all and you got nothing. So, no, there were no slave holders in the north. none that weren't hiding and trying to keep it a secret.