I imagine it's because Americans use foreign accents to make the fantasy more foreign itself. If the wizard who cast a spell to alter the passage of time starts talking like the dude that runs the gas station on the corner, maybe it takes away some of the magic.
Damn, someone got you with a downvote within 3 minutes of posting. That shit was quick, didn't think the Fediverse got down like that. Wasn't me for the record
But, you don't believe the "American Culture" is popular? I'd be real interested in a counter argument to the fact it is popular. It's pretty easy to show that American media and politics are pretty discussed or enjoyed around the world.
And I'm not sure what you mean about us appropriating from migrants. Do you consider every American a migrant due to the fact that America is so young?
Something like the last thing you said. I mean they killed most of their natives and the traditions they had, I'm sure there's even more latinos there that there is people decending from the native nations.
So if their "culture" didn't came from their own land, then from where? People who came there: Migrants.
Edit: Mispellings (if it isn't clear enough, english is not my first language lol).
hollywood and americas massive industry has effectively given it a chokehold on western culture, to the point where western culture practically just means 'cultures that take their cue from the usa'