What is really interesting is that Libra will be backed by a basket of currencies... which is what I think the US is really worried about. After the Great Depression and Second World War, the prevailing idea was to set up the world economic order (suggested by Keynes I think...) with a basket of world currencies (Bancor?) to act as the world reserve currency... thus not enabling any one country to gain too much of an economic advantage by acting as the single world reserve currency.... somehow, that didn't happen, and the USD was set up as the world reserve...