So? Walk onto a set and I bet you'll find people from every continent except Antarctica there. People born on those continents too, not just descendants.
- What language do they speak?
- What cultural nuances are they bringing to their films? Local food, local culture?
99% of US films have little to do with international perspectives, much less with local cultures.
A black man eating a Big Mac is a person eating a Big Mac, no matter how black he is.