Are you questioning whether abolitionists were liberals? Do you really have such a limited grasp of history? Why do you have such a hard time grasping the concept that Republicans can be Liberals?
The Conservatives of the Civil War era took the easy way out and advocated allowing each state to make the decision to be slave or free. Conservatives advocated the repatriotation of escaped slaves. Guess what? Many of these conservatives were Democrats
Guess what? NO they were NOT. This is typical left-wing propganda b.s. Liberals have ALWAYS been Democrats. The GOP was not liberal and suddenly "morphed" into conservatives. The cold, hard, truth that you work so hard to deny with your propaganda is that the left was ALWAYS racist and pro-slavery. In the 1960's, who fought the hardest against civil rights? The Democrats! It was the GOP leading the way on civil rights. But let me guess, waaaaay back in the 60's, the GOP was all liberal and the Democratic party was all conservatives, right? It was Democrat Robert Byrd of West Virginia who spent 50 years as a Senator AND as a member of the Klu Klux Klan. Sorry my friend, you can try to twist history all you want. The truth always comes out in the end.
You are obviously born in the post Reagan era and have always lived in a time when Democrats were liberals and Republicans were conservatives. Prior to Reagan and specifically Newt Gingrich there were many Republicans who held liberal views, especially on social issues. Look at Republicans like Nelson Rockefeller or even some of Richard Nixons and Gerald Ford. Conversely, look at Dems like George Wallace.
In terms of Civil Rights, there were no southern politicians of either party who supported Civil rights. You could not be elected dog catcher in the south if you favored integration.
I'm afraid politics is not as cut and dried as you were brainwashed to believe