What’s the difference? The vast majority of the “dollars” I hold are electronic and have never been anything but. The fed electronically gave some bank money which eventually got to my employer’s bank’s computer, and then went to my bank’s computer. It’s all just 1s and 0s at this point. Sure I got about $100 cash in my wallet, but that’s just mad money. My “real” money ain’t real.
Most people have no idea what happens behind the scenes when two companies in different countries conduct business with each other on a large scale. You simply can't do it without conducting the transaction through a financial system that has the faith and confidence not only of both companies, but of their host countries and all the intermediaries along the way.
The U.S. dollar isn't just backed by the military of a global superpower, but by a financial infrastructure that can conduct transactions across the globe in fractions of a second.