Citizenship identifies an individual's national origin. It defines his/her rights and responsibilities to that country (nationality). Most people have only one country of citizenship, but some can have dual nationality. U.S. citizens can be native-born, foreign-born, or naturalized. They owe their allegiance to the United States and are entitled to its protection.
Dual citizenship (or dual nationality) means a person may be a citizen of the United States and of another country at the same time. U.S. law does not require a person to choose one citizenship or another.
If you are a citizen of another country and have questions about that country's laws, policies, and mandatory military service, contact that country's embassy or consulate.
For information on dual nationality from the point of view of another country, please contact that country's embassy or consulate.
If you have dual citizenship and plan to travel to or from the United States, you must use a U.S. passport to enter and leave the United States.
If you were born outside the United States and your U.S. parent(s) did not register your birth at the U.S. Embassy or Consulate, you may apply for a U.S. passport, but you will need:
Your foreign birth record showing your parents' names
Evidence of your parent(s) U.S. citizenship
Your parents' marriage certificate
If you were born outside the U.S. and your U.S. parent(s) registered your birth with a U.S. Embassy, the U.S. Department of State (DOS) will be able to help you get a copy of a Consular Report of Birth Abroad (Form FS-240).
U.S. Citizenship for People Born Abroad or in U.S. Territories
You are a U.S. citizen if:
You have a birth certificate issued by a U.S. state or territory. If you were born in a U.S. territory, but do not have a birth certificate issued by that territory, you may be able to verify your citizenship status using other documents.
You were born outside of the U.S. to at least one U.S. citizen parent and your parent(s) recorded your birth with the U.S. Embassy or Consulate in that country:
If the embassy or consulate did not issue a Consular Report of Birth Abroad and you are 18 years of age or older, learn how to get a Certificate of Citizenship from U.S. Citizenship and Immigration Services (USCIS) instead. This document is proof of your U.S. citizenship.