All money in a modern economy is created out of thin air ...
Yea, but, the US dollar has been king for quite a long time.
Darrell Francis, Economics BA, graduate-level work in monetary policy
Answered Aug 4, 2016
The US dollar is the official currency of the following countries:
The United States (obviously)
It is also used several non-US territories, such as the British Virgin Isles, Caribbean Netherlands, and Turks & Caicos Islands.
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Also, I have traveled extensively throughout the world, having traveled to 88 countries. The US dollar has always had a good exchange rate in the majority of countries. The exception in my finals days of foreign travel was Cuba where the US dollar is discounted by 10% plus the currency exchange fee. That is the reason, people visiting Cuba should take Canadian dollars or Euros.