Baseball: Dominican Republic

I've wondered lately why the Dominican Republic has produced so many baseball players (Alfonso Soriano, Miguel Tejada, Pedro Martinez, Albert Pujols, David Ortiz, Raul Mondesi, Sammy Sosa, Julio Franco) but I can't think of any from Haiti, even though they share the island of Hispaniola. (According to this article, about one in seven current Major League players were born in the D.R.) The beginning of this book review offers a clue. And here's an article about the Dominican dictator who brought in players from the Negro Leagues, including Satchel Paige. (Be sure to read Satchel's "Rules For Staying Young".)