France has its wine. Germany has its beer. And Puerto Rico has its rum. Not lightly do they call this small island the rum capital of the world. Over 70 percent of the rum sold in the U.S. comes from Puerto Rico; it's the island's chief export.It's also part of the island's history. Juan Ponce de Leon first brought Creole sugar cane rootstocks from La Española (Dominican Republic) in 1506. The first sugar mill was established in Añasco in 1517. Rum production began in the 1650's, a byproduct of the sugar cane industry on which Puerto Rico made its early living.