So apparently the US Supreme Court has just given 40 US states the green light to begin issuing their own gold and silver-backed currencies.
Quote from the SC decision:
The United States maintains a dual system of banking, made up of parallel federal and state banking systems. That dual system allows privately owned banks to choose whether to obtain a charter from the Federal Government or from a state government.
www.supremecourt.gov/opinions/23pdf/22-529_1b7d.pdf