I don’t remember signing on to letting the constitution apply to me, but it works because Americans agree it does, the exact same way as delegated powers to the government, the exact same way this very website is used for political commentary and news rather than gaming and casual conversation, because we AGREE it does at a wide enough level to make it so. That’s how nations operate, that’s what a social contract is, it’s everywhere and unspoken, so yes, the social contract is legit, because you’ve been operating on it for ages.