The Caribbean island of Hispaniola‚ shared by Haiti and the Dominican Republic‚ has been divided for centuries‚ sometimes bitterly‚ by language‚ race‚ history and culture. As Haiti descends further into chaos and collapse‚ the divides are becoming concrete—literally. The Dominican Republic is speeding up work on a wall along the 250-mile border cutting across the interior of the island. Dominican President Luis Abinader is aiming to block human smugglers or criminals from...