1. There were 8 times as many anti-slavery associations in the south than the north.
2. Outlawing slavery was already being widely discussed in state legislatures.
3. Only 3% of white southerners owned slaves. They were really expensive (young male was around $100,000 in todays money) so only the rich could afford them. One of the flash points was slavery but the main issue was state’s rights. The 97% who didn’t own slaves did not fight for rich people to own slaves - not by a long shot. They fought for states rights.
Slave owner does not = ‘southerner’. It is important that you disabuse yourself of that notion.
Then what % were Northerners?