A better analogy is the way Europeans come to America, visit New York City and L.A., and think they know everything about the nation as a whole, as if the U.S. is a homogenous culture, rather than a conglomerate of roughly 10 or 11 different cultures. The worst part is that the majority of Europeans (yep, I'm generalizing) I encounter seem to think that the massively exported American pop culture is representative of U.S. culture, when it is absolutely not. I grew up in rural Appalachia (West Virginia, western Virginia) and the culture for both business and informal activities is vastly different than that of the Deep South, West Coast, Mid Atlantic, etc.
See this book: http://www.amazon.com/American-Nations-History-Regional-Cult...
Compared to Europe, it certainly is.
From a merely linguistic viewpoint, in North America there's English and Spanish (Ok, and native american languages, but they're really not much spoken).
In Western and Northern Europe, there's French, Italian, Dutch, German, Swedish, Danish, Norwegian, and Finnish.
The thing is, identity is a matter of contrast.
See this : http://squid314.livejournal.com/306048.html
because a language is not much spoken, it doesn't count?
A langage that isn't much spoken is one you're much less likely to encounter.
I neglected them because they're numerically negligible, and because if I had cited all native languages in the United State, I should then, too, have procedeed to cite all minority languages from Western Europe, which are more widely spoken.
There are, for instance, 13 million native speakers of Bavarian. By comparison, there's less than 3 millions native americans in the United States.
I could have been more pedantic, but for brevity's sake, I decided not to go too much into details.
My point stands.
I'm very well aware of the significant differences between the Deep South and the West Coast etc, but those differences pale in comparison to the vast centuries old cultural differences you can find in Europe even between towns only a few dozen miles apart. Hell, the differences inside the US barely compare to regional differences within small European countries.
This is not a matter of ignorance. Even in well educated and well traveled Americans seem to be unable to really comprehend the depth of cultural differences outside the US.