<<Do you think that the South could have peacefully seceded if it had given up slavery?>>
Of all the other reasons given as causes for the Civil War, I don't think all of them added up together even came close to the influence of the slavery issue. If slavery weren't an issue, I don't think the South would have ever chosen to secede. But hypothetically, if it had so chosen, I don't believe the North would have let it go. I think by that point in time, the vision of a new continent-wide world power from the Rio Grande to the Great Lakes (including the populated parts of Canada) was a very potent force in the North.