@BillRM,
http://en.wikipedia.org/wiki/Political_status_of_Puerto_Rico
In 2005, the U.S. House Committee on Resources concluded that Puerto Rico is still an unincorporated territory of the United States under the Territorial Clause, that the establishment of local self-government with the consent of the people can be unilaterally revoked by U.S. Congress, and Congress can withdraw, at any time, the American citizenship now enjoyed by the residents of Puerto Rico as long as it achieves a legitimate Federal purpose, in a manner reasonably related to that purpose.[124]
In 1993, the United States Court of Appeals for the Eleventh Circuit stated that Congress may unilaterally repeal the Puerto Rican Constitution or the Puerto Rican Federal Relations Act and replace them with any rules or regulations of its choice.[150] In a 1996 report on a Puerto Rico status political bill, the U.S. House Committee on Resources stated, "Puerto Rico's current status does not meet the criteria for any of the options for full self-government under Resolution 1541" (the three established forms of full self-government being stated in the report as (1) national independence, (2) free association based on separate sovereignty, or (3) full integration with another nation on the basis of equality). The report concluded that Puerto Rico "... remains an unincorporated territory and does not have the status of 'free association' with the United States as that status is defined under United States law or international practice
", that the establishment of local self-government with the consent of the people can be unilaterally revoked by the U.S. Congress, and that U.S. Congress can also withdraw the U.S. citizenship of Puerto Rican residents of Puerto Rico at any time, for a legitimate Federal purpose.[151][152] The application of the U.S. Constitution applies partially to Puerto Rico by the Insular Cases.[