Puerto Rico is an unincorporated territory of the United States, officially known as the Commonwealth of Puerto Rico (or Estado Libre Asociado de Puerto Rico in Spanish). Its residents are U.S. citizens who are subject to federal laws and use the U.S. dollar. The island maintains substantial self-government in local affairs while remaining under the authority of the U.S. Constitution, particularly in areas like defense and foreign relations.

Castillo San Felipe d... 18