Wait, you can like “hold” a door open? What, with your hand? I’m European and I’ve literally never heard about that. I thought slamming doors straight in other people’s faces was a universal thing. Learn a new thing every day.
I kid, of course. But for real, what makes you think of door-holding as a uniquely American thing?
Where I’m from in Europe I think most people sort of think of it as just basic common courtesy, especially for older/disabled/people carrying stuff. At least, that’s what’s taught, but I wouldn’t speculate on how often it actually happens here vs. the US. I did also once have a colleague from the US who was extremely (almost performatively, I would say) friendly about those kinds of small, polite gestures. So what do I know.