Yeah I’m aware legislation can vary a lot between states, I suppose I’m more talking about what one might call a minimum federal standard? To take an example, legal drinking age is technically free to be set by states, but the federal government will stop paying for highways if it’s below 21, or something along these lines.
Correct, no comma before the last element if it is preceded by a conjunction (e.g. “et”, that is “and” in English) in French