If a state were to secede to avoid a federal law, then all federal laws become irrelevant in that state. Along with any opinion from the Supremes.South Carolina--or any other state--isn't going to succeed. That's happened once in our history, and it's not going to happen again. Even Texas, which has the greatest chance of surviving on its own, will never leave the Union. It can't afford to, nor can any other state.
Such titles are misleading and only add to the hysteria. Three lawmakers introducing a bill that only states the state can consider leaving (which it already can) doesn't mean it will do so. There is dubious legality towards unilateral secession. In Texas v. White, the United States Supreme Court ruled unilateral secession unconstitutional. In most cases, it's pure hyperbole...
https://www.washingtonpost.com/news...u-s-a-four-step-guide/?utm_term=.e20e35b6e08d
State law would then be the law of the land, within the state's borders .
Of course there are laws to prevent secession, but once a state secedes , they aren't bound by those laws.
I mean, that's the point of secession .