MIAMI – Jean-Marie Denis raised a metal gate and unlocked his Little Haiti bookstore, stocked with books printed in Creole and French.His shop sits next door to the Little Haiti cultural complex, designed like a turn-of-the-century Haitian gingerbread house painted in vivid Caribbean yellow and teal. Nearby is a Haitian Christian church, the Haitian restaurant Piman Bouk, Haitian murals reading “Help! Haiti is being strangled,” and an elementary school named for Toussaint Louverture, who led the slave revolt that liberated the island nation.Denis, who goes by Jan Mapou after his store, Libreri Mapou, has long been a fixture in Miami’s...