I am aware that Pleasantville 1998 showcases the golden age of American TV shows back in the 50s, and this question wouldn't have been asked if the movie didn't depict/hint/symbolized some sort of racism between the "grey" people and "colored" people. (what with the sign NO COLORED ALLOWED
, and so on).
I know that casting African-Americans in Pleasantville would complicate the story because of the segregation between "grey/colored" people, and I can understand that if they were added, they would need to weave them into the story in a not-so-straight-manner.
But the question is: was it uncommon for TV shows of that era to cast actors that are African-Americans?