Did MLB integration kill black interest in baseball?
After seeing this movie, I did some reading up on the history of the Negro Leagues. It dates back to the 1860's at minimum, and possible goes back further (just like how the true originals of the professional leagues are a little hazy). The charters for the white leagues did not explicit forbid black players, but they heavily encouraged teams to blackball black players (not pun intended). However, the Negro Leagues were very popular in black communities, and still drew huge crowds. It wasn't like the WNBA that was funded by the NBA to absorb losses to spur interest in basketball for women.
However, Jackie Robinson and integration quickly killed off the Negro Leagues (which admittedly had been struggling for a few years at that point). The result was whites, blacks, and Latinos playing for an audience of mostly white people. And it continues to this day, you have many black superstars, but still mostly white fans. But as we can see from the movie, there was a time that baseball was just as much a part of black lives as white lives.