You are correct. If the Framers of the Constitution believed in a right of secession at will, they would have put it in the document, written about it in the Federalist Papers, or discussed it so that it would appear in Madison’s Notes. Yet all are silent.
Yeah, completely silent, except for that DECLARATION OF INDEPENDENCE thing.
Are you serious?
Its the opposite. Had they intended that each state not have the right to do exactly what they had just done 8 years earlier when each unilaterally seceded from the British Empire, they would have noted it. Yet they did not. They even added one amendment to the constitution laying out that the rights listed in the Bill of Rights did not encompass all the rights there were (so nobody could argue silence = consent for the federal government to grab for more power) and they added another amendment which made clear any powers not delegated to the federal government by the states were reserved by the states.