States absolutely have a right to secede, how could they not? Any union that's not based on mutual consent is no true union.
A union certainly does not imply a right to unilateral secession. And even the Confederacy explicitly prohibited leaving it. This is leaving aside whether or not this is desirable.
that northwest ordinance I don't know enough to have an educated opinion on. Was the Missouri Compromise, I would say it wasn't against because it was agreed to, it was a product of consent.
What do you mean, 'agreed to'? By whom? Certainly not by the territories in question, as it was just an absolute prohibition of slavery north of 36'30. It was not popular sovereignty.
A union certainly does not imply a right to unilateral secession. And even the Confederacy explicitly prohibited leaving it. This is leaving aside whether or not this is desirable.
What do you mean, 'agreed to'? By whom? Certainly not by the territories in question, as it was just an absolute prohibition of slavery north of 36'30. It was not popular sovereignty.