[Frumious Bandersnatch]

Try this - pretend that you have a contract that contains only one solitary clause - the sumpremacy clause.

Now what rights and powers have been delegated, and what has been prohibited? None, on both counts - it's just a statement that asserts that this contract takes legal precedence over others.

True, except the supremacy clause does not stand alone in the U.S. Consititution.  So your argument is not applicable here, as there are plenty of delegated rights and powers that it refers to.

[4CJ]

True, except the supremacy clause does not stand alone in the U.S. Consititution. So your argument is not applicable here, as there are plenty of delegated rights and powers that it refers to.

But you've asserted that the supremacy clause is what prevents secession. Now you acknowledge that the supremacy clause grants nothing.