In the Major Antilles (Cuba, Puerto Rico, Hispaniola):
Cubans dump on Puerto Ricans,
Puerto Ricans dump on Dominicans,
Dominicans dump on Haitians,
Haitians are the lowest on the ladder.
In a nutshell:
When Fidel came to power in Cuba in 1959, the majority of wealthy professionals got up and left. Many came to Puerto Rico to live and set up their offices ( doctors, lawyers, engineers, etc. ). Puerto Ricans were their hired help. This made some Cubans feel superior to their Puerto Rican employees.
As the economic situation worsened in the Dominican Republic, many poor Dominicans got up and left. Many came to Puerto Rico to live and work as best they could. Dominicans were hired help. This made some Puerto Ricans feel superior to their Dominican employees.
In addition, as the economic situation worsened in Haiti, many poor Haitians got up and left. Many crossed into the Dominican Republic to live and work as best they could. Haitians were hired help. This made some Dominicans feel superior to their Haitian employees.
Finally, the Haitians are f@cked as they have nobody to whom they can feel superior!