I was referring to how political correctness changes over time. The Hays code was the political correctness of its time. Western movies with only white cowboys were political correct in their time. It is just the term "political correctness" that is new, not the concept.

You can call it "group-think" or you can call it "cultural values".

I was responding to the suggestion that there was a time and place without "political correctness". I dispute that. Every time and place have some ideas of what is and isn't morally acceptable. But if you are born into it, it may be invisible. The majority of the audience at the time did not wonder why there were so few black cowboys in movies. But they noticed it when more black cowboys started to appear.