"I'm not talking about political party, I'm talking about ideology. It was Southern *conservatives* in the 1800s and 1900s who tried to keep black people from voting."
Of course you're not talking about political parties, because we all know it was southern DEMOCRATS that were pro slavery, not Conservatives. Conservatives, as a whole, have always been against the enslavement of anyone and we fought a bloody war to prove it. There were a lot of Conservative Democrats (at least Conservative by today's standards) that were against slavery. But as a whole, the Democrats were pro slavery, not Republicans. And don't give me any of this bullshit about the "great party switch," because that's a lie and never happened.
Democrats have always been about slavery. They were pro slavery in the 1700's, 1800's, 1900's, and the 2000's+. The only thing that has changed outwardly is the racial group makeup.