They may not coin money..which the founders said was worthless money..like paper.
You're simply reading the above passage from the Constitution wrong. The operative word there, is "make".
You're reading it to mean "produce", which is not what the word means in that sentence. In that sentence, the word, "make" means "cause, or cause to be executed", or, "by means of", or, "to impart authority or quality to".
In other words, the only thing that states were given the authority to use as legal tender in the payment of debts was gold and silver coin, which ONLY the US Congress was given the authority to produce and regulate.
But they may coin-gold and silver-a tender-in payment-of debts.
No, they may NOT coin gold and silver coin for any purpose. That is spelled out in the clause preceding that one.
What they CAN do, is ONLY "make" gold and silver coin the legal tender for the payment of debts. They do not have the authority to "make" any other medium a legal tender for the payment of debts.
Enjoy your paper money.
Each state can coin its own money as long as it is gold and silver. And there isnt a GD thing you or your federal government can do about it.
Your no Texan.