Chris

The Euro was not designed along the same mechanisms as the US Dollar. If it had been, it wouldn't be in the mess it currently is in.

In the USA there is a system of fiscal transfers between States, which prevents wealth piling up in the rich states such as California to the detriment of the poorer ones. No such system exists in the Eurozone. It would be politically impossible to bring about; it would require Germany to permanently subsidise Greece. It continues to work in the USA because there is a single cultural and political consciousness that prevents resentment over the fact that industrious Californians effectively subsidise large swathes of the rest of the country (California, if independent of the USA, would still be one of the biggest economies in the entire world and IIRC still in the G7). Meanwhile in Europe resentment is already building in Germany as people who have worked hard and saved carefully are asked to hand over more and more of their hard-earned to prop up Greece, which has made far too little effort to reform its own economy into something capable of existing in a monetary union with mighty Germany.

There is no common cultural or political consciousness to diffuse the resentment building in Europe over the rich northern states bailing out the poor southern ones. Quite the opposite. The hare-brained scheme that is the Euro, designed to lash warring, quarrelsome nation states together so as to prevent future conflict, is in danger of actually causing conflict.