But it doesn’t. The states are free to ignore federal law. Yes, the states can’t stop the feds from doing enforcement themselves, but it would be basically unpr

But it doesn’t. The states are free to ignore federal law. Yes, the states can’t stop the feds from doing enforcement themselves, but it would be basically unprecedented outside of a few limited examples. So no, the line is definitely not as clear as “federal law supersedes state law, period.” It’s a lot more nuanced than that, and in practice, in most situations it’s the state law that reigns supreme.