http://www.nytimes.com/2005/04/17/weekinreview/17bawer.html?_r=2&pagewanted=1
The title says it all:
"We're Rich, You're Not. End of Story."
Never mind the fact that the Euros couldn't stop killing each other until the US intervened, and that since 1946, the Euros have lived under the blanket of protection and stability which the US provided. I don't mean that as an insult, but I think it's an important factor to consider when discussing relative wealth. In other words, the US has created more wealth despite all the dead weight economic loss of the US's military activity.