[Non-Sequitur]

I just like to have something to back up my opinions...

So do I. Supreme Court decisions, writings of Madison, that sort of thing.

[HenryLeeII]

Well, as has been shown, the SCOTUS decisions you cite do not refer to the Constitution or Federal law, and as 4ConservativeJustices rightly points out, they had to depend on international law to justify the blockade in the Prize Cases. And you know as well as I that there are no writings by Madison (particularly during the ratification debates) that argue for a prohibition against a state from withdrawing.