There is a European Central Bank, of course, established and it has the structure similar to the Federal Reserve system, not precisely the same but similar.
In the United States, securities markets are much more developed than they are in Europe.
The prices of all imports would rise if the dollar depreciates.
To the extent that the United States has, I don't like the word hegemony, the United States has influence around the world, I don't think that's based on to any significant degree on the fact that countries use the dollar as their major reserve.
There has been talk in Europe about American hegemony being somehow based upon the use of the dollar in the world. I just don't see that connection at all.
Some countries that are close to Europe that already hold Deutschemarks, clearly would automatically hold euros, those are countries in Eastern Europe mainly, a few countries in Africa.