Which, of course, occurred after the North made a gigantic fuss over the South's doctrine of "nullification," which was subsequently overturned by an increase in Federal power.
If it wasn't the right thing to do for the South to override Federal legislation, why was it the right thing to do for the North?
Heh....I would have supported the right of the South to secede but I have no illusions about the pro-slavery nature of the CSA. I would have also supported John Brown's rebellion.