The whole point is to make money. Irregardless of not having a common heritage. An economic bolc of well over 300 million citizens will be able to compete much better with the U.S and the emering economic superpowers in China and the Asian subcontinent. Why would Denmark for example want to go it alone with their own currency when the can have the Euro with the power of all of Europe behind it driving it as an economic powerhouse?

I live in the U.S. and lets say that for example Montgomery, Alabama and New York City have very little in common culturally, however the power of the dollar on the world economic stage helps an economically backwater state like Alabama exactly the same as Manhattan. The people of the two places may have nothing in common and never co-mingle, however their money works for both of them. Do you really think that Alabama would like it's own currency without the backing of the rest of the U.S.? I imagine not, they would be a dirt-poor third world nation. New York on the otherhand would still be a world player...not on the same level, but still doing very well. California could make a similar argument. I happen to live in the South, but I have very little in common with most poor southerners (rednecks), we don't co-mingle, however their money spends exactly the same as mine.

What is the difference between that and say a wealthy Parisian and a poor Lithoanian...the Euro spends the same for both. The power of the Euro around the world is working for both as well. The economic tide will raise all boats just like wealthy and poor states in the U.S.

In short (not that it's possible at this point): There is strength in numbers.