To be sure there had been black characters featured in comics since the Golden Age. But the less said about them the better. They were a reflection of their times. Mimicking the negative stereotypes that were found in the movies. It was during the Silver Age that you began to see black characters that were positive role models for young black comic book readers. And that taught young white comic book readers to reject the old stereotypes.
In Fantastic Four No.52 we got the first black super-hero to appear in a mainstream comic book...T'Challa, the Black Panther. The only thing that you can compare it to was when Jackie Robinson broke Major League Baseball's "color barrier in 1947. In 1947 no matter what baseball team you rooted for if you were black the Brooklyn Dodgers automatically became your second favorite team. Captain America was my favorite super-hero.But the Black Panther immediately became my second favorite super-hero.
The other day I was watching THE SINS OF RACHEL CADE (1961) starring AngieDickinson and Roger Moore. The movie is set in Africa and features Woody Strode and Rafer Johnson in supporting roles. Watching the two athletes turned actors set me to imagining them in a 1966 Black Panther movie with Johnson as T'Challa and Strode portraying his father T'Chaka.