All the quotes I can find from the notable people at the time, like Washington, considered the union indissoluble. They considered it a compact requiring assent of all the members for individual states acting unilaterally/seceding.
The compact is broken. Worse now than it was back in the 1800s.
The state legislatures, the consent of the governed, voted to leave the union back then. They were forced back at gunpoint. That is no longer a union - it is servitude to a master. It is sanctioned slavery. It is no different than forcing an abused and beaten wife back into the bed of her tyrannical husband so she can be abused legally and without recourse.
Eventually such governing creatures make themselves into gods that determine life and death itself. And so we have become as a nation under a beast.
A union, which is what the U.S.A. is, would hardly be a union if states could leave any time they felt like it. We wouldn't have a country, we'd have chaos.
We already have chaos under this union, fostered by this union, promoted by this union and trampling the inalienable rights of those whom are now targets of political punishment and subjugation. It has arbitrarily made itself god, and is working to affront the Most High himself and those who are obedient to Him. It makes law by decree and via corruption using threat to force itself on the populace under pain of penalty. Therefore, it has abrogated any moral authority it had and this union no longer serves liberty - but undermines it while making itself the sovereign.
You're justifying Statism. The States have an inherent right to leave the union when it becomes clear to their people that the Federal Beast, having administered a long train of abuses and usurpations pursuing the goal of absolute despotism and requiring fealty to the Federal Government. The right to leave a broken covenant is our right and our duty, as it is to throw off such government, and establish new guards for their security. The soap box and ballot box are corrupted beyond redemption and liberty no longer has any voice outside of lip service. Everything now revolves around the state and what the state must provide and what the state must do to restrict those targeted for plunder and punishment.
I do not care what you wish to cite from the Constitution. Nothing in there applies to the people, rather it applies only to the Federal Government. And since the Federal beast no longer abides within it's constraints and ignores it when it serves their agenda while abolishing clear enumerated rights in favor of rights they have invented sans enumeration - The federal government is lawless and has removed itself from any moral authority. All it now has is agents that will put guns to your head to force compliance with whatever it dictates.
It is 1775 and 1861 all over again.
But this time, the vast majority of the population WANTS the Crown to become more oppressive and all-encompassing under a new banner and flag of Communism and Statism.
To remain a "union" all states will be required to become part of that new paradigm.
Which is occurring right now as I type.