I don't think the US would issue a crypto. It could just be the anarchist in me, but I think the US wants to maintain control of its centralization of money.
Centralized money is a powerful and trackable control tool. This is why the US is employing even more draconian laws against crypto.
On an off note, I considered creating a coin 100% backed by horse manure and issuing tokens to members of the US politico.
How do you think they'd feel if I paid my taxes in HORSE.SHT?
RE: U.S. CRYPTO CURRENCY...???