E. Burke
Banned
Crucially had the planter class been destroyed (not executed by losing their lands and exiled) there would be no leadership.
Further if former slaves had land they would not be dependent on the old ruling class as they were in otl. They would be harder to intimidate out of their rights.
With intelligent political leadership you would have as many people who 'really' supported slavery and sessession in 1885 and Germans who were 'really' Nazis in 1965
Basically this, also build up an alliance of poor whites and freedmen. It's not it wasn't their, "those who didn't own slaves hated those who did". You'd just have to be smart. Get both groups into school together and build up a mythology of mutual opposition to the planters. Mythologize Bacon's Rebellion and shit. Make the confederacy out to be a rich man's scheme. Might not be perfect, but isn't awful.