U.S. immigration law does not provide a specific definition of “citizen.” The Fourteenth Amendment to the U.S. Constitution identifies as a citizen anyone born in the U.S., except for children of foreign diplomats, and anyone naturalized after their birth. Since this is still not a distinct definition, U.S. citizenship is perhaps better described as a set of rights and duties, including the duty of loyalty to this country. Some people who become naturalized U.S. citizens retain citizenship in their country of origin. The U.S. Department of State (DOS) does not encourage dual citizenship, but the Supreme Court has held that it is permissible despite language in federal immigration statutes suggesting otherwise. Immigrants who wish to become naturalized U.S. citizens should consider the effect it might have on their relationship to their country of origin, and their future relationship to this country.
The Immigration and Nationality Act (INA) defines a “national” as “a person owing permanent allegiance to a state.” 8 U.S.C. § 1101(a)(21). It defines a “national of the United States” as someone who meets the previous definition with regard to the U.S., or who is a U.S. citizen. Id. at § 1101(a)(22). Congress has modified the laws regarding citizenship in, or allegiance to, more than one country on numerous occasions. Currently, the INA states that a person seeking to become a naturalized U.S. citizen must take an “oath of renunciation and allegiance,” which includes a statement that they “renounce and abjure absolutely and entirely all allegiance and fidelity” to any other country. Id. at § 1448(a)(3).
While a renunciation of allegiance to any other country is a requirement for naturalization, the INA does not provide a clear means of enforcing this oath. It states that both native-born and naturalized citizens can lose their U.S. nationality by “voluntarily…obtaining naturalization in a foreign state upon his own application,” serving in the military of a country “engaged in hostilities against the United States,” and other voluntary acts. Id. at §§ 1481(a)(1), (3). This does not, however, address most situations in which a naturalized citizen continues to avail themselves of citizenship in another country.