What is the problem in Dominican Republic?

The Dominican Republic is fraught with numerous problems including violence against women and against immigrants from Haiti, the degradation of the environment, and principally inequalities in the education system.

It is a divided country but why do they cause irritation from migrants in Haiti?

The Haitians imposed a heavy tax on the Dominican and nationalized most private property, both of which led to economic decline. The Dominicans rebelled against this Haitian government, and the legacy of animosity between these two countries grew.