system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do so many British actors get cast in roles as Americans but Americans playing Brits is almost unheard of?

Yes I'm aware of Brad Pitt in Snatch.
gpt
It's not unheard of at all, it happens all the time. Ever see *The Lord of the Rings*? Elijah Wood, Viggo Mortensen, Sean Astin, Liv Tyler, Hugo Weaving (Australian) all playing vaguely British-sounding characters.

How about Natalie Portman in *V For Vendetta*? RDJ in *Sherlock Holmes*? *Bridget Jones’ Diary*? The cast of *This Is Spinal Tap?* Johnny Depp in every other movie he's in?