A United States (U.S.) citizen by birth or naturalization. Citizens by birth include:
- Persons born in the 50 states, District of Columbia, Puerto Rico, Guam, and the Virgin Islands. Also considered citizens are U.S. nationals from American Samoa, Swain's Island, and North Mariana Island.
- Children born in a foreign country to a U.S. citizen who was born in the U.S.
A naturalized citizen is a person born outside the U.S. who gained citizenship through INS.