Non-citizen national
A non-citizen national is an individual who owes permanent allegiance to a country but is not a citizen of that country. Non-citizen nationals may have some rights and privileges of citizenship, but they are not considered full citizens and may have restrictions on their ability to participate in certain activities or receive certain benefits. This status is often given to individuals from U.S. territories or other areas under U.S. jurisdiction who are not considered U.S. citizens.
A non-citizen national of the United States is a person who owes permanent allegiance to the U.S. but is not a U.S. citizen. This status is distinct from U.S. citizenship and also different from national political status. Non-citizen nationals do not have the same rights and privileges as U.S. citizens. Typically, a non-citizen national is someone who was born in an outlying possession of the U.S., such as American Samoa, Guam, or Puerto Rico, or has a parent who is a non-citizen national. They cannot vote in U.S. federal elections.
Source: Section 101(a)(22) of the INA provides that the term “national of the United States” includes all U.S. citizens as well as persons who, though not citizens of the United States, owe permanent allegiance to the United States (non-citizen nationals).
Source: 8 U.S. Code § 1101(22)(B)
(22) The term “national of the United States” means(B) a person who, though not a citizen of the United States, owes permanent allegiance to the United States.