[Para-Ord.45]

If you were factually accurate plenty of States would have left by now.
Hasn`t happened for good reason, reality.

Article I Section 10.

No state shall enter into any treaty, alliance, or confederation... No state shall, without the consent of Congress, lay any duty of tonnage, keep troops, or ships of war in time of peace, enter into any agreement or compact with another state, or with a foreign power, or engage in war, unless actually invaded, or in such imminent danger as will not admit of delay.

[MamaTexan]

That's correct. A State of the United States is prohibited from certain acts by the Constitution.... but once a State leaves the Union, they are no longer part of the 'United States' and thus no longer bound by the terms of the compact.