A photo from open sources
But is it? Try to pay with paper in the store, to for example, candy wrappers or trolleybus tickets. Will not work. A the dollar has weight, and what a weight! And this is the only currency of global importance.
So what makes it valuable, and how do Americans regulate dignity of the dollar. Why, for example, do not print countless a lot of bills (it would seem so simple!), but at the same time, and do not make their currency scarce.
Watch a little video about this, which if it doesn’t open, it will certainly open your eyes to the international currency American origin.