what is NOT PROHIBITED by the Constitution is PERMISSABLE.
the RIGHT of secession (which is that of the PEOPLE as represented in mass by their state(s) was NEVER CEDED to the federal government;therefore, it REMAINS one of the POWERS of the several states.
free dixie,sw
Murder and rape are NOT PROHIBITED by the Constitution. I guess you think that they are PERMISSABLE.
Besides, unilateral secession as practiced by the Southern states in prohibited by the Constitution. The Supreme Court said so.