How about this?
"This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding."
If the Constitution says it isn't allowed, then it isn't allowed. Regardless of what the ratification document said.
OK then. Just show me where the Constitution says (none of this implied crap) that secession is not allowed and game over! You win!