Regarding other countries adopting the US as their currency, it exemplifies the extent to which other countries are accepting US sovereignty. The issuing of money is a sovereign power. The dominant power is not audited. Keith, I'm puzzeled by your concluding comment Governments have not had a stranglehold on the issuing of money. What governments have done in the past, and no longer do, is regulate the private money issue in the interests of the people.
Money is what money does.
The refugee probably has a better understanding than the rest of us.