"the 50s, 60s, 70s, and even the 80s didn't feature that many latin stars, at all. perhaps american baseball simply wasn't a big interest for them in the 60s -- its probable that would hold true 40 years prior to that."
Or it's just that it took awhile for them to get integrated.
Guess you're forgetting guys like Roberto Clemente, Juan Marichal, Luis Apparichio (sp?), Dave Concepcion, Fernando Valenzuela...