There was rampant government censorship, it was at the state level all because the Supreme Court said motion pictures weren't protected by the 1st amendment in

There was rampant government censorship, it was at the state level all because the Supreme Court said motion pictures weren't protected by the 1st amendment in 1910, reversing itself in 1950s after the damage was done and culture wide censorship was expected by American families. Circumstances like this are why industries don't lay off on lobbying. To add to your second point, a lot of European and Middle Eastern people changed their names to blend into the white majority power as their subgroup was not seen favorably for most of the 20th century and were many times not considered to be part of an amorphous “white” group which meant worse treatment in jobs housing credit and court rulings, this issue and distinction has mostly evaporated with "white" being expanded and reduced to skin tones in the later 20th century in the US with there very little interest or cognizance of pre-US heritage. This just being another example how invisible minorities and ability to "pass" to attain privileges, where people with different skin tones and visible phenotypes simply could not change those things and discovered that people with other similar phenotypes experienced surprisingly similar outcomes.