No reason to preserve state's rights? Have you kept up with the last 150 years since they were destroyed?
There would have been secession sooner or later with or without slavery. The federal government has done nothing but overreach since its inception and secession would have been tried for any number of reasons.
There hasn't been any serious drive for secession other than in support of slavery during all of U.S. history.
Well, of course, there hasn't been a serious drive for secession since 1865. Duh...people don't want to be invaded, raped, maimed, and pillaged by federal troops.
But, still you are wrong. There was a serious drive for secession in New England that culminated in a convention where their grievances were discussed and secession was narrowly avoided. Andrew Jackson's victory at New Orleans nipped it in the bud by ending the War of 1812, their opposition to that being their most immediate reason for wanting secession.
