Perun said:
European countries and US States are a bit different from each other. I'm talking about such petty factors as language, culture, history, religion, social system... Pure geographical area does not play any role here. They are a bit more than administrative divisions.
Per, be serious here. There are HUGE differences between different parts of the USA, just as there are in Germany. Compare the languages, cultures, and histories of the following places:
Northern Maine
San Antonio, Texas
South Carolina
Harlem, New York
the Upper Penninsula of Michigan
San Andreas Valley, California
Appalacia
They all speak dialects of English and have the same flag (some still prefer the Confederate one...), but their hstories, cultures, foods, even diction is completely different. If they spoke different languages you'd swear you were different parts of the world. You're speaking with the suppositions and conceptions of an outsider. It'd be as if I said Bavaria, Holstein, Salzburg, and Tirol were essentially the same because they all speak German. You have to appreciate the subtlties of the geographical and historical differences, how they interact with one another, and what kind of people they have produced.
Technically, all 50 of the states are autonomous entities which, much like those in the EU, have agreed to pool their resources in certain matters (embodied by the federal government). This was, I'll admit, proven to be untrue in practice during a minor disagreement in the 1860s.
I'll admit, Canada is much more culturally homogenous than the USA (excepting the French-English thing). But even here in the English provinces, it'd be fallicious to say that they're culturally identical. (One thesis has it that there are 6 basic socio-geographic regions here...I'm not sure I buy it entirely)
Just remember that just because you, an outsider, can't iimmediately see the cultures of the USA doesn't mean they don't exist. What you see of America is what comes to you via the lenses of European bias. America isn't just the way the European (and American) media depicts it.