Yes, this is a fact that people in the Bitcoin, and recently, Dogecoin communities have come to realize. I think this realization is a gift that cryptocurrencies could bring to the general population. There's nothing magical about a US Dollar. It's a unit of account, nothing more.
If you really want to fall down the rabbit hole, then learn about the (original) concept of Ryan Fugger's Ripple. The recent Ripple company does implement the Ripple idea of allowing individuals and communities create and trade their own units of account, but is presently emphasizing other features of their system. But you can absolutely use all the (well-done) Ripple software in the manner that Ryan Fugger originally imagined: