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 and to exercise their rights and responsibilities as citizens.
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.
For an adult immigrant to become a U.S. citizen, he or she must go through the process of naturalization. GENERAL requirements for naturalization call for the immigrant to:
Be at least 18 years old at the time of filing the Application for Naturalization, Form N-400
Be lawfully admitted permanent resident of the United States
At the time of the filing the application, have been a permanent resident in the United States for at least for five years OR for at least three years if you meet all eligibility requirements to file as a spouse of a United States citizen
Have demonstrated continuous permanent residence
Have demonstrated physical presence
Have lived within the State or United States Citizenship and Immigration Services District for at least three months prior to filing
Have demonstrated good moral character
Demonstrate an attachment to the principles and ideals of the U.S. Constitution
Demonstrate an ability to read, write, speak and understand basic English
Demonstrate a basic knowledge of U.S. history, government, and civic principles