And they could be aliens. The naturalization acts that pertain to Puerto Rico, Guam and the Virgin Islands do not specify that either parent must be a US citizen, nor that either parent have ever resided in one of the 50 states.
Cbodt, by “aliens” you mean that they would not be U.S. Nationals?
At this time, we have only a few unincorporated territories that are populated whose population isn’t by Act of Congress citizens of the U.S. One of these - American Samoa - has a population that is U.S. Nationals but not U.S. citizens. They are not aliens in the following sense: they have a right to naturalize. Aliens don’t have such a right. Immigrating here is for us to decide.
The Marshall Islands is one of two sovereign countries in free association with the United States. (This means we provide them with foreign aid and assure their national defense, and in return, we can use their territory for our joint national defense.) The people there are not U.S. Nationals. They actually are aliens.
Is that what you’re talking about?