> The US is a constitutional republic, it does not have a system where anything Congress decides is law.

Really now? Then why does it say in the Constitution that it was created to pass laws?

Your constitution literally has limits on what sort of laws congress can pass, i.e. "congress shall make now law..."

Yes, a very small list of NOs. Everything else goes.

Huge list of "No"'s. The "No"'s are a core part of the American system, whereas the absence of "No"'s is a core part of the British system.