Do you really think that even if you packed SCOTUS with the most strict constructionist jurists that they would not unanimously rule it unconstitutional if a state tried to secede?
any HONEST reading of the 10TH Amendment to the BOR, would be PERSUASIVE.
in TX v. White, the justices i believe would have found secession to be LAWFUL, had they not feared the outcry of the people, after they realized that "lincoln & his merry band of criminals" had CHOSEN/forced them into a war for NOTHING of VALUE! (such an HONEST, Constitutional ruling might well have provoked a REAL "civil war".)
a MILLION Americans DIED for lincoln's FOLLY.
free dixie,sw