No first States’ Rights was the cover the Slavers used. But the only “right” in question was a right which does not exist. Slaves were slaves not because the state said they were, they were slaves because of tyranny and injustice.
There has never been a Natural Right to enslave another man.
That is an interesting comment; about the “Slavers” I mean.
Now, let's name the American slave states that voted to enshrine slavery into the United States constitution: New York, New Jersey, New Hampshire, Connecticut, Pennsylvania, Massachusetts, Rhode Island, Delaware, and Maryland.
Oh yes - Virginia, North and South Carolina, and Georgia were slave states too.
Now a question: did the Union slave state of Delaware send soldiers to fight the Confederate slave state of Virginia in order to end slavery or to protect slavery?
Did the Union slave state of Maryland send soldiers to fight the Confederate slave state of North Carolina in order to end slavery or to protect slavery?
Did the Union slave state of Kentucky . . . and so forth and so on.