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.
Relinquishment of United States nationality
People who relinquish U.S. citizenship generally have lived abroad for many years, and nearly all of them are citizens of another country. Unlike most other countries, the U.S. does not prohibit its citizens from making themselves stateless, but the State Department strongly recommends against it, and very few choose to do so. It is usually impossible to relinquish citizenship while in U.S. territory, and courts have rejected arguments that U.S. state citizenship or Puerto Rican citizenship give an ex-U.S. citizen the right to enter or reside in the U.S. without the permission of the U.S. government. Like any other foreigner or stateless person, an ex-U.S. citizen requires permission from the U.S. government, such as a U.S. visa or visa waiver, in order to visit the United States.