This set of links are resources associated with contemporary history of the Caribbean. The left hand column has resources by type and the right hand column has resources organized by state.

United States Central Intelligence Agency. Central America and the Caribbean. Map. Washington, D.C.: Central Intelligence Agency, 2002. Library of Congress. https://www.loc.gov/item/2008621835/.
Puerto Rico is part of the U.S. Look at the 19th Century or Contemporary primary source guides for more collections that include Puerto Rico.