Puerto Rican citizenship
A 1918 official report from the American colonial governor of Puerto Rico to the U.S. Secretary of War, this one after the Jones Act of 1917, had become law, states that the "passports...[are used to] prove a person's nationality," thus making clear that Puerto Rican citizenship and Puerto Rican nationality were one and the same. The United States government also recognizes this status in its own records. For example, the CIA World Fact Book, states that the nationality of Puerto Ricans is not "American" but, in fact, ""Puerto Rican"." The Spanish Government also recognizes Puerto Ricans as a people with Puerto Rican, "and not American," citizenship. It also provides Puerto Rican citizens privileges not provided to citizens of several other nations, such as Haití, Jamaica, Trinidad y Tobago y Guyana. Since 2007, the Government of Puerto Rico has been issuing "Certificates of Puerto Rican Citizenship" to anyone born in Puerto Rico or born outside of Puerto Rico with at least one parent who was born in 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.