In general, most countries want you to use their passport when entering their country as a citizen. U.S. law generally requires U.S. citizens to identify themselves using a U.S. passport when entering the U.S.

A dual citizenship means that a person is a citizen of two countries at the same time. This means that the person has legal rights and obligations for both countries. Having a dual citizenship can also have some disadvantages. For example, a person having a dual citizenship might have tax obligations for both countries or would have to fulfill a residency requirement between the two countries.

How Can I Acquire Dual Citizenship?

A person in the U.S can acquire dual citizenship in the following ways:

  • Being born in the U.S .to immigrant parents
  • Being born in the U.S. with one parent being a U.S citizen and one parent being a citizen of a different country
  • Becoming a U.S. citizen through naturalization while being a citizen of another country
  • Becoming a citizen of another country while maintaining U.S citizenship

Is It against U.S. Law to Have More than One Passport?

No, there’s nothing in U.S. law that forbids a U.S. citizen to possess both a U.S. passport and a foreign passport, provided that the person really is a citizen of both countries. However it’s possible that your other country might have objections to multiple passports. This is very likely for countries that don’t permit dual citizenship.

Is My Other Citizenship Relevant when Entering the U.S. as a U.S. Citizen?

No. U.S. citizenship law is primarily interested in determining if a person wishing to enter the U.S. should be let in. If you hold a U.S. passport you have a legal right to be let in, remain, and work in the United States. Holding another citizenship is irrelevant in determining if you are a U.S. citizen or not. A dual citizen has no special status in the U.S.

When Could It Be a Problem Traveling on Two or More Passports?

Carrying two passports has it’s burdens and using the right passport at the right times can sometimes be a confusing process. The first is whether or not the countries you hold passports for allow dual citizenship. Some countries give you a hard time when you are a citizen of two countries. 

If another country forbids you to have one of its passports and a U.S. passport at the same time, you might have trouble traveling between the U.S. and other countries, since U.S. law generally (exceptions are to/from Canada, Mexico or Caribbean Countries other than Cuba) requires U.S. citizens to identify themselves using a U.S. passport when entering or leaving the U.S.

Do I Need a Lawyer?

If you are traveling back to a country of which you are a citizen, you should be aware that it is probably not relevant that you also are a U.S. citizen. If you face any issues with immigration services in the U.S., it may be vise to talk to an immigration lawyer experienced in dealing with these government entities.