America would instantly refuse to trade with them and force everyone they could to do the same utterly destroying the country.
Gaddafi, and Saddam Hussein both wanted to introduce currencies backed by gold. This whole oil for gold movement, is why both of these guys were murdered by the US state, why their countries were invaded and looted for their entire Gold reserves.
In short the powers that be don't want this to happen and will go to the furthest extent to prevent it