I want to know one thing: What's the regulatory police body guarding the USA state mint?

Because, if there isn’t the mind could…let’s drop over the metal coins. Let’s focus on the bills. In my opinion, the metal stays where it stays, the bills are nothing but ink and paper. My point: if the mint prints less coins and bills than how many are necessary for the salary of an entire nation, the metal has some value in weight, that is, it can be paid in weight, but the bills are nothing but wastepaper. And, as a side note, in the USA, people recur to Fort Knox. But what about other nations? My hypothesis is that they’ll recur to forgers. Or other nations still must repay national debt of the first bankrupted nations. What do you guys think about all this?