Disputes - international:
Haitian migrants cross the porous border into the Dominican Republic to find work; illegal migrants from the Dominican Republic cross the Mona Passage each year to Puerto Rico to find better work

Refugees and internally displaced persons:
stateless persons: 133,770 (2016); note - a September 2013 Constitutional Court ruling revoked the citizenship of those born after 1929 to immigrants without proper documentation, even though the constitution at the time automatically granted citizenship to children born in the Dominican Republic and the 2010 constitution provides that constitutional provisions cannot be applied retroactively; the decision overwhelmingly affected people of Haitian descent whose relatives had come to the Dominican Republic since the 1890s as a cheap source of labor for sugar plantations; a May 2014 law passed by the Dominican Congress regularizes the status of those with birth certificates but will require those without them to prove they were born in the Dominican Republic and to apply for naturalization; the government has issued documents to thousands of individuals who may claim citizenship under this law, but no official estimate has been released
note: revised estimate includes only individuals born to parents who were both born abroad; it does not include individuals born in the country to one Dominican-born and one foreign-born parent or subsequent generations of individuals of foreign descent; the estimate, as such, does not include all stateless persons (2015)

Illicit drugs:
transshipment point for South American drugs destined for the US and Europe; has become a transshipment point for ecstasy from the Netherlands and Belgium destined for US and Canada; substantial money laundering activity in particular by Colombian narcotics traffickers; significant amphetamine consumption