I'm far from an expert on economics, but I thought a large part of the value of a currency is the country backing it. If you are a business in the US, you are r

I'm far from an expert on economics, but I thought a large part of the value of a currency is the country backing it. If you are a business in the US, you are required to accept payment in the form of US legal tender. i.e. Walmart can't decide tomorrow that they will only accept rubles (or, more relevantly, Bitcoin). So as long as there are people in the US doing business, the US dollar retains value.