By now you've certainly heard of Gary Sheffield's expert sociological analysis of major league baseball's minority population.  It's kind of complex, and it's unlikely you'll be able to comprehend it if you don't have your doctorate, but I'll try to explain it terms you can understand: the influx of Latino MLB players has coincided with the drop-off in black players because you can control the Hispanics but not the blacks, dawg.

"I called it years ago. What I called is that you're going to see more black faces, but there ain't no English going to be coming out. … [It's about] being able to tell [Latin players] what to do — being able to control them.  Where I'm from, you can't control us.  You might get a guy to do it that way for a while because he wants to benefit, but in the end, he is going to go back to being who he is.  And that's a person that you're going to talk to with respect, you're going to talk to like a man.  These are the things my race demands.  So, if you're equally good as this Latin player, guess who's going to get sent home?  I know a lot of players that are home now can outplay a lot of these guys."

I'd say that about sums it up.  It couldn't have less to do with young blacks in America playing other sports, or the "fact" that young Latin Americans eat, sleep, and breathe baseball.  In reality, America is chock-full of young blacks who can outplay Albert Pujols, Manny Ramirez, and Vlad Guerrero.  But Bud Selig put them all in prison because he's racist.  True story.