The Euro is the national currency of a country that does not exist. Though there is a continent of Europe, as there is of America, there has never been a country of the United States of Europe, and there probably never will be.
The Euro is therefore not a currency as is the American dollar, and yet it is forced to masquerade as one—badly—by the Maastricht Treaty, in which the countries of Europe abandoned the right to produce their own genuine national currencies.