What makes dominicans so looked after baseball players ?

I remember training with a coach that was really good training sluggers in little leagues and the kids he trained were also very good but that's it ! and then guys from Rep. Dominican are brought here to play baseball ...? where did the dots got disconnected ?|||The Dominican Republic has a very warm climate which allows young players to practice all year round and become very good at the game. Same with places like Panama and Venezuela but those players don't often get very many opportunities to leave their country.|||oh jay