The countries seem to disagree on a lot of words, including "president", "citizenship" and "constitution", so I'm a bit in doubt about your question. However, there is no way that the Euro can work, unless there is a political union, and we do have that. It doesn't have a significant military edge, and some other parts may be troublesome, too - and I don't know what the result of that will be.
Some of the key countries, when talking about further centralization of power in Europe, are Ireland and Denmark. In Denmark, it requires a referendum to transfer power from the Danish government towards any supernational body, and that's why we had a lot of referendums. We haven't seen the last one, yet.
However, when you look at USA, it's not a homogeneous country, either, and many things are less harmonized in USA than in EU. I don't think political integration is the most important for the Euro currency right now - better integration of the language-specific markets seem more important. Right now, you can have very positive economic figures in one language area, and 50km away, in another language area, you have bad economic figures, and workers are not able to take jobs easily 50km away, because they don't know the language and many other things they need to know. And the CB still has to decide an interest rate that fits both. |
