It is a great thought Jcrescenzi. Unfortunately people are far too invested in the rhetoric of the Civil War then its reality. People on our side ( Conservative) refuse to say that Lincoln could have done bad, while people on the other side, refuse to listen to anything but word "Slavery" which fits so well within their agenda.
Tariffs, and Government rights were far more important than any other issue in Civil War. Which, if someone just took a second to think, would make sense. Think, how many would fight for or against a Slave? Especially in the bloody, disgusting trenches of the Civil War.