The separate independence and individual sovereignty of the several states were never thought of by the enlightened band of patriots who framed this Declaration;(in other words the revolutionary founding fathers never thought of the several states as sovereign on their own)
the several states are not even mentioned by name in any part of it, as if it was intended to impress this maxim on America, that our freedom and independence arose from our union, and that without it we could neither be free nor independent. (No mention of states individually in the DoI because the founders knew our freedom and independence was from America as a whole)
Let us, then, consider all attempts to weaken this Union, by maintaining that each state is separately and individually independent, as a species of political heresy, which can never benefit us, but may bring on us the most serious distresses."(here he tells the South Carolina ratifiers that they need to forget the idea that each state is sovereign by itself. And if they dont forget that idea it will cause problems.)
Kalamata have you had a chance to figure out what James Madison meant when he said The constitution must be adopted in toto and forever.
If the US Constitution had contained a no state secession clause IT WOULD HAVE NEVER BEEN RATIFIED.
E Pluribus Unum.