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."
Puerto Ricans
Puerto Ricans became citizens of the United States as a result of the passage of the Jones-Shafroth Act of 1917. Since this law was the result of Congressional legislation, and not the result of an amendment to the United States Constitution, the current U.S. citizenship of Puerto Ricans can be revoked by Congress, as they are "statutory citizens", not "14th Amendment citizens". The Jones Act established that Puerto Ricans born prior to 1899 were considered naturalized citizens of Puerto Rico, and anyone born after 1898 were U.S. citizens, unless the Puerto Rican expressed his/her intentions to remain a Spanish subject. Since 1948, it was decided by Congress that all Puerto Ricans, whether born within the United States or in Puerto Rico, were naturally born United States citizens.