OK, good comment. For the record, I do know that is not how ethnicity works. Basically, I'm just throwing an idea out there that I know is hard to defend. The time frame is not correct (maybe 300 years is not enough time, I actually don't know how much time is needed) and there are other issues, as mentionedFirst off, wow, that is just incredibly not how ethnicity works. Nonwhite people aren't just white people with more pigment -- good grief. were still no Asian people in Logan's Run.
I'm not trying to say that the people that live in this future would look ethnically like white people of today. I would assume that 300 years in the future would have people looking like a mixed race group. I remember seeing a cover story in a popular magazine in the 1990s where they showed a woman with a mixed race look (medium skin tone, and Asian Aftrican Caucasion features) and the article mentions (I think) a 300 year time span for this to be what the human race will look like. We could imagine a people looking like that but then having lighter skin with better survival value in the dome environment.
But, if you make a movie in the 1970s, it might be hard to find enough people with this look, and the acting skills and the notoriety needed, which means using makeup or other effects. But, clearly this was not in the minds of the movie makers.
A completely different line of thought could be that people were in fact selected for the dome based on genetics. This could have had a racist motivation combined with the practical factor of needing people with the right traits for that environment. The movie seems to imply that eugenics are being employed by the computer controller.
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