I don't know about your analogy. You defend secession in defense of slavery by comparing it to secession in defense of access to abortion or gay marriage. Then or now, all three would be wrong. And unconstitutional.
“Then or now, all three would be wrong. And unconstitutional.”
But legal. Which was his point.
Virginia, in their acceptance of the Constitution, made it explicitly clear that they withheld the right to withdraw from that Union...and here is the relevant phrase—”We the Delegates of the People of Virginia....declare and make known that the powers granted under the Constitution being derived from the People of the United States may be resumed by them whensoever the same shall be perverted to their injury or oppression and that every power not granted thereby remains with them and at their will.” New York and Rhode Island also had clauses that allowed secession...Since all these states ratification of the Constitution was considered valid, then the clauses where they secured that right to secession was also valid—and due to the equal protection clause, what was valid for one state would also be equally valid for another.