People tend to generalize, but I'ven reading YA for a time, and I clearly see that they talk many times about Southern European countries as different from Northern European ones, even I've seen many questions in which they question if people from the North has a different race from people from the South.
Anyway, I think that it depends on what you compare, because there are many differences among European countries, but if you compare them with African, Asian, or even American countries( which I think would be the most similar to Europe), then you can find more similarities with the rest of European countries than with the countries from other continents.
There are some similarities between UK and USA in terms of the establishment of Law and so forth - but beyond that not much apart from a shared common language.
As for comparing USA to Europe the idea is preposterous - first off, just take the foundation of Western Civilization - it is in no way American but is in fact entirely Greek, even if various savages over the centuries, including the Germans have tried to destroy it.
Here in UK our oldest parliamentary building, Westminster Hall, is 900 years old and when we started building it we still thought the Earth was flat and that if you went far enough out into the Atlantic you fell off the edge into the abyss.
No - there is no comparison between UK and USA - we've got Stonehenge and we know who built it, our ancestors, the DNA proves it. Only a few Americans are even remotely aware of who actually found America and who settled it first and it was not the Red Indians, it was in fact Europeans from what is now southern France many thousands of years ago.
https://www.youtube.com/watch?v=GS5eDwYe...
There is one thing which Americans can never escape from and it's the simple fact that they, in the majority, came from Europe. And far far longer ago than even they know of.
After the Siberians crossed the ice land mass 20,000 years ago, the first human arrivals were European, Spanish and French in today's US in the early 1500's, and Dutch and English in the 1600s
Haha, I actually live in Europe and it's not seen like that AT ALL. We see us all as different countries with entirely different identities. However, I have seen US films where people have desired a wish to visit 'Europe' and I do think that as a bit silly. But still, people in my country (UK) express their wish to visit America, which is a huge generalisation as well :)
Technically European countries are 'states' as well as nations and countries, but not in the same way as US states.