Puerto Rican citizenship
In 1952, upon U.S. Congress approving the Constitution of the Commonwealth of Puerto Rico, also reaffirmed that Puerto Rican citizenship continued in full force. This was further reaffirmed in 2006 while the U.S. Senate probed into the President's Task Force on Puerto Rico's status. In 1953, U.S Ambassador Henry Cabot Lodge Jr., in a memorandum sent to the United Nations, recognized that "the people of Puerto Rico continue to be citizens of the United States as well as of Puerto Rico."
Insular Cases
In 1898, the United States signed the Treaty of Paris (entered into force April 11, 1899), which ended the Spanish–American War and granted the United States the Philippines, Puerto Rico, and Guam. Additionally, Cuba remained under the jurisdiction of the United States Military Government until its independence on May 20, 1902. Since there was nothing in the United States Constitution about governing newly acquired territories, the government used the guideline from Title IX of the Treaty of Paris. Those that were born in Spain but living in one of the territories, peninsulares, “could retain their Spanish citizenship,” or even eventually have the option to become United States citizens. Title IX of the Treaty of Paris did not grant the same rights to the indigenous population. Edguardo Melendez writes, “Puerto Ricans and Filipinos-- ‘the natives of the islands’-- not only remained colonial subjects but became stateless peoples too: they were denied the right to keep their Spanish citizenship, as well as their right to become U.S. citizens.”