From the Document: "The Dominican Republic occupies the eastern two-thirds of the Caribbean island of Hispaniola, which it shares with Haiti. The Dominican Republic is a key U.S. partner in the Caribbean because of its comparatively large size, strong economy, and stability. In recent years, the United States and the Dominican Republic have maintained close commercial ties under the Dominican Republic-Central America-United States Free Trade Agreement (CAFTADR) and cooperated on regional security concerns under the Caribbean Basin Security Initiative (CBSI)."
CRS In Focus, IF10407
Congressional Research Service: https://crsreports.congress.gov/