If I'm remembering my history correctly, the Republican party was founded specifically as an abolitionist (or at least anti-slavery) party. But, please, give the dimocRATS credit for their accomplishments -- founding the KKK and passing Jim Crow laws. :=)
Don't forget the "Red Shirts" The demoRatic party founded that group to murder black and white Republicans after the Civil War. Got that little piece of info from a PBS special no doubt.