alt Hacker NewsYou are so stereotypical, it's very funny :-).
I believe that there is a bit of an asymmetry between US people and... well the rest of the world, in that the WHOLE world has some level of insights into the US. Whether they want it or not, for many different reasons.
However, the US don't typically have a good insights into... the rest of the world. Which does make sense: the rest of the world is pretty big.
Of course the US is more complicated than "they elected Trump". Sure, there are 50 states. But everybody knows that (be it just because your president repeatedly threatens to annex Canada as the 51st state ;-) ). People in the rest of the world do not need to "live in the US" to have that level of insights, because the US makes sure they do, by force if necessary.
The mere fact that you don't seem to be aware of this asymmetry at all suggests that you over-estimate your "pretty good insight into all of Europe".
As counterpoint, though, I've heard some absolutely bonkers impressions of the US made by some Europeans. And that's not isolated; there seem to be lots of Europeans who have some very strange ideas about what it's like in the US.
I do agree with your general point, though: I would expect your average European to have a better understanding of the politics of the US than your average American would have of even a prominent European country like Germany.