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Here, "The People" mentioned in the Constitution, refers to the People of the individual state, not the United States as a whole; that's who ratified the Constitution, they did NOT do it by one massive vote; and neither did they CONJOIN their sovereignty via the Constitution to form a single sovereign body.
So in short, the South was right in its claims of national sovereignty, period.
9 months, 4 weeks ago on Who’s Supreme? The Supremacy Clause Smackdown