When the states ratified the Constitution, the federal government in its three distinct branches was born. The Constitution is the legal document that gives what we call the federal government (actually three branches of government) its power. The Constitution is the agreement wherein the states delegated some of their power to this government under the terms of the Constitution.
All three branches of the federal government, executive (POTUS), legislative (Congress), and judicial (SCOTUS) have broken that agreement by ignoring and/or overriding the text and original intent of the Constitution. Therefore, the states are no long bound to abide under this rogue government.
The preservation of this union depends on the sworn oath every single officer of each branch takes: To preserve, protect, and defend the Constitution of the United States. Without a working, authoritative Constitution, we simply do not have a true union, only the (temporary) appearance of one. We no longer have the adherence to the rule of law and values of liberty the people and states relied on in their original ratification.
I don't want to see this union dissolved but it is the three branches of the federal government, not the states, that is in the process of dissolving the bonds of this union. Behind this is a spiritual malaise wherein the people have allowed this disintegration to take place. What are the states to do? Those states with enough of those having Christian values and a will and purpose to preserve, protect, and defend the Constitution may have to band together in some sort of collective rebellion against this rogue government. Maybe a New America with strict adherence to the original Constitution and its Amendments will emerge, but anything lasting must have the rule of law (not the rule of the whims of man) and a belief that God, not government, grants us our rights to life, liberty, and pursuit of happiness. Somewhere, somehow there will be enough of us who will declare "Give me liberty or give me death" and the battle will be waged with guns if necessary.