I don't see it. The 1930s weren't that long ago, there are still people alive who lived through them. If you were talking about ancient Egypt, you might have a point.
it's usually inappropriate to feed a troll, but I'll just say "olympic gold champion was congratulated by literally Adolf Hitler, but not his own country the Unite States - because he was black"
I recommend you read the book "Pimp" by Iceberg Slim, about a Black America in the early/mid 20th century.
Personally speaking, I found the book very 'awe-inspiring'/it made me go 'wow' a bunch, because I found the author's experience so completely different from my own :)