Topic on Forum:Trope Talk
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How about All Demographics Are American?
This is a subtrope of Creator Provincialism/Audience Provincialism and is a supertrope to Politically-Correct History. The idea is that a work must represent the racial etc. diversity of the American population, no matter if it fits the setting and regardless of where or when the work was made.
Edit to add: I was tired when I wrote the previous part, but I probably should have mentioned that I meant this as a new possible related trope. This proposed trope has become increasingly prevalent, and I'm not just talking about science fiction.