That Article deals with Amendments.
If the other states united, they would first strip a state of its statehood, which mean that it was no longer a state and therefore not entitled to any suffrage in the Senate.
Without that relationship, that severed state would now become a separate nation.
Since secession is not in the Constitution, it is not Constitutional. Just what part of the Ninth and Tenth Amendments DON'T you understand? I'd be ashamed to be publicly stating such.
I understand that the States are States due to the relationship with the other States in the Union.
The powers that they have, they have as States, which means they have to part of the Union to have those powers.
The States that joined the Confederacy did so as States not independent nations, and as such were forming a compact with other States in the Union and were in violation of the Constitution they had agreed to as States.
Moreover, the right of a State to secede from the Confederacy isn't given in its Consititution either.
That word doesn't show up at all.
But what does show up is the reason for the Confederacy's existance.
The Confederate States may acquire new territory; and Congress shall have power to legislate and provide governments for the inhabitants of all territory belonging to the Confederate States, lying without the limits of the several Sates; and may permit them, at such times, and in such manner as it may by law provide, to form States to be admitted into the Confederacy. In all such territory the institution of negro slavery, as it now exists in the Confederate States, shall be recognized and protected by Congress and by the Territorial government; and the inhabitants of the several Confederate States and Territories shall have the right to take to such Territory any slaves lawfully held by them in any of the States or Territories of the Confederate States.
But forming compacts with other states is forbidden under the Constitution. A state not IN the union is not under such restriction.
The States were always in union with some other states (hence they never were nations).
They cannot form compacts with other states to form alternative Unions, which is what the Confederacy was.
Neither does perpetual, permanent, or irrevocable.
I win, you lose, so long, farewell, goodbye.