re: OK, I've got one:
Certainly there are exceptions. I'm talking about general trends.
The thing about movies produced before 1965 is that the American prototype is always white.
For the most part, you're right. Still, I remember Sidney Poitier, and I remember the black protagonists that replaced him in the movies later in the 60s and 70s. Not sure that was an improvement in role models, either.