I think that it should. Puerto Rico is too culturally, linguistically, and societally distinct from the United States to be considered a natural part thereof. Assimilating the Puerto Ricans living in Puerto Rico is a logistical and ethical impossibility; the opportunity to do so disappeared long ago, and it is by virtue of the continued possession of Puerto Rico by the United States that is a major factor in the general failure of assimilating the Puerto Rican population living in the American mainland. So, in order for America to be a linguistically homogeneous nation (with all people being able to speak the same language, English), as well as a culturally homogeneous nation (by which Puerto Ricans in the American mainland are made to accept the English language, the American culture, and American values as being first and foremost), Puerto Rico must become an independent country.