I've heard it called "US Defaultism" where most Americans online seem to assume that everyone they interact with is from their country and all US news is considered significant even when it really isn't.
I do lean moee towards us defaultism being the case as other country news does get posted but has zero to none interaction because the us posts threads are getting so much more activity.
Outside Lemmy I use Apple News and what I kind of hate about it is even while traveling abroad you’re stuck with US news. I have both English and Spanish languages set up on iOS so being in a Spanish-speaking country, it would be nice to see local news in either language.
The community news@lemmy.world used to have it in their rules, that it must be US news, same as on the old site. I just looked, and it's no longer a rule on lemmy.world
I’ve been guilty of that- commenting before checking what community the post was in. Thankfully, I’ve found that most people outside of the US prefer gentle correction. Unfortunately, I doubt the average person from the US would show the same courtesy if the roles were reversed.
I find that it correlates more with education status than nationality... but therefore it surely is more rare among the set of average Americans who have access to the internet than globally.