The people on this forum aren't rude, nasty, etc. Most of the internet communities are full of terrible people. Here, not so much. I don't bother with places where a good portion of the criticism isn't exactly constructive. (Also I misread wardenferry419's last sentence there, so my sentence made sense in the context of the misreading).
The States and the European countries are pretty comparable in terms of geography, and sometimes even travel, economic relations, and government. It is a bit of apples and oranges comparison, but even apples and oranges have a lot in common. It wouldn't be hard for me to hop in a car and hit four other states without changing directions, and I live in a part of the country where there aren't any small states. I imagine it's similar for Europe, except Europe has a lot more small countries. I'd expect someone to be able to name all the major jurisdictions they can drive to in a day.
And I can name the internal divisions, or at least some, of many countries. Mostly just from watching TV and reading fiction. European internal divisions can be hard because it seems they've all had so many that have changed, somewhat quickly, over the centuries. You might be surprised how many European countries are younger than the U.S. (and probably most countries in the New World). A lot of European countries are younger than me.