Citizenship of the United States
A person who is considered a citizen by more than one nation has "dual citizenship". It is possible for a United States citizen to have dual citizenship; this can be achieved in various ways, such as by birth in the United States to a parent who is a citizen of a foreign country (or in certain circumstances the foreign nationality may be transmitted even by a grandparent) by birth in another country to a parent(s) who is/are a United States citizen/s, or by having parents who are citizens of different countries. Anyone who becomes a naturalized U.S. citizen is required to renounce any prior "allegiance" to other countries during the naturalization ceremony; however, this renunciation of allegiance renunciation of citizenship to those countries.
Citizenship of the United States
The Immigration and Nationality Act of 1952 (INA) made a minor distinction between U.S. citizenship and U.S. nationality. Citizenship comprises a larger set of privileges and rights for those persons that are U.S. citizens which is not afforded to individuals that are only U.S. nationals by virtue of their rights under the INA. It is well-established that all U.S. citizens are U.S. nationals but not all U.S. nationals are U.S. citizens.