[Michael.SF.]

While it ... constitutionally wrong

What clause of the Constitution dictates the voluntary entry into the agreement as being a one way street?

Recall that though slavery was morally wrong, it was Constitutionally permitted.

You cannot argue the Constitution both ways.

[wideawake]

What clause of the Constitution dictates the voluntary entry into the agreement as being a one way street?

Article VI paragraph 2 clearly states that the Constitution and federal laws are the supreme law of the land and that the federal judiciary has the right of review of all state laws and acts.

By ratifying the Constitution each state formally acknowledged this supremacy.

[wideawake]

Recall that though slavery was morally wrong, it was Constitutionally permitted. You cannot argue the Constitution both ways.

I'm not.

Slavery was legal. Insurrection was never legal.

The South's constitutional breach consisted of its insurrection.

[Non-Sequitur]

What clause of the Constitution dictates the voluntary entry into the agreement as being a one way street?

Thirty seven of fifty states didn't voluntarily enter anything. They were admitted, and only with the permission of a majority of the states as expressed through a vote in Congress. Why shouldn't leaving require the same?