The SBC was founded, entirely and explicitly, to support white supremacy.
Until the 1830’s there was one Baptist Church. Many of the northern congregations were abolitionist, who pushed for the entire denomination to make their missionaries disavow slavery. That’s why there was a schism, that’s how the Southern Baptist denomination came into being.
That’s also where they came up with the idea of literal reading of scripture, and the whole concept of biblical inerrancy — because there’s some verses about how slaves are supposed to be obedient and should never rebel, and some about how people of different tribes/races shouldn’t mix.
(for more information… Slacktivist writes about this fairly often.)