Yes, the United States allows dual citizenship. No federal statute prohibits an American from holding citizenship in another country at the same time, and no law forces a choice between the two. The State Department puts it plainly: “U.S. law does not require a U.S. citizen to choose between U.S. citizenship and another (foreign) nationality.”1U.S. Department of State. Dual Nationality The status itself is settled. What trips people up are the obligations that come with holding two passports.
The Legal Basis
There is no “Dual Citizenship Act.” The status exists because different countries’ nationality laws operate at the same time, and U.S. law simply does not object. The State Department acknowledges that “persons may have dual nationality by automatic operation of different laws rather than by choice,” and goes further to say that “U.S. law does not impede its citizens’ acquisition of foreign citizenship whether by birth, descent, naturalization or other form of acquisition” and that “a U.S. citizen may naturalize in a foreign state without any risk to their U.S. citizenship.”1U.S. Department of State. Dual Nationality
The constitutional backbone comes from two places. The Fourteenth Amendment’s Citizenship Clause protects the status of anyone born or naturalized in the United States.2National Archives. 14th Amendment to the U.S. Constitution – Civil Rights (1868) And in Afroyim v. Rusk (1967), the Supreme Court held that Congress has no power to strip a person of U.S. citizenship without their voluntary consent.3Justia Supreme Court Center. Afroyim v. Rusk, 387 U.S. 253 (1967) The government cannot cancel your citizenship just because you happen to hold another one.
How People End Up Holding Two Citizenships
Birth on U.S. Soil
The Fourteenth Amendment grants citizenship to anyone born on American soil, regardless of the parents’ nationality.4Constitution Annotated. Amdt14.S1.1.2 Citizenship Clause Doctrine If the parents are citizens of another country that also grants citizenship based on parentage, the child holds both from birth. No one files anything.
Birth Abroad to a U.S. Citizen Parent
A child born outside the United States to one American parent and one foreign parent can acquire U.S. citizenship at birth under 8 U.S.C. § 1401(g). The American parent must have lived in the United States for at least five years before the child’s birth, with at least two of those years after the parent turned fourteen.5Office of the Law Revision Counsel. 8 USC 1401 – Nationals and Citizens of United States at Birth If both parents are American, the physical-presence requirements are generally easier to meet. The child typically picks up the other parent’s country’s citizenship at the same time.
Naturalization
Foreign nationals who become U.S. citizens by naturalization can keep their original citizenship if the other country allows it. The process runs through Form N-400, biometrics, civics and English tests, and the Oath of Allegiance.6U.S. Citizenship and Immigration Services. 10 Steps to Naturalization Eligibility generally requires five years as a permanent resident, or three if you’re married to a U.S. citizen.7U.S. Citizenship and Immigration Services. N-400, Application for Naturalization The reverse works the same way: an American who naturalizes elsewhere keeps U.S. citizenship.
What the Oath of Allegiance Actually Does
Every new citizen promises “to renounce and abjure absolutely and entirely all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty.”8Office of the Law Revision Counsel. 8 U.S. Code 1448 – Oath of Renunciation and Allegiance On its face, that sounds like it should end any second citizenship. It doesn’t.
The State Department treats the language as a commitment to the United States, not as a mechanism that cancels foreign nationality. No one at the ceremony collects your other passport or notifies your birth country’s consulate. The U.S. government has no authority over another nation’s citizenship laws and doesn’t pretend to. Whether the oath ends your other citizenship is a question for that other country’s law, not for the U.S. oath.
The Real Constraint Is the Other Country’s Law
Dual citizenship requires both countries to permit it. The U.S. side is open. Several major countries are not. China, Japan, India, and Singapore prohibit or severely restrict dual citizenship. Japan requires citizens to pick one nationality by age 22. India does not allow dual citizenship at all, though it offers an Overseas Citizenship of India card as a partial substitute. If you naturalize in the United States and your birth country falls into this category, that country may treat you as having forfeited your original citizenship automatically. The U.S. answer is yes, but the answer that governs your specific situation is whatever the other country says.
Rules the U.S. Does Enforce on Dual Citizens
Enter and Leave on Your U.S. Passport
Under 8 U.S.C. § 1185(b), it is unlawful for a U.S. citizen to depart or enter the country without a valid U.S. passport.9Legal Information Institute. 8 USC 1185 – Travel Control of Citizens and Aliens The Foreign Affairs Manual reinforces this specifically for dual nationals.10U.S. Department of State Foreign Affairs Manual. 7 FAM 080 – Dual Nationality Using your foreign passport for travel to your other country or third countries is fine. At the U.S. border, show the American one.
Worldwide Income and Foreign Account Reporting
The United States taxes based on citizenship, not residence. If you are a U.S. citizen, the IRS expects a federal return reporting worldwide income every year, even if you live permanently overseas and earn every dollar abroad.11Internal Revenue Service. Frequently Asked Questions About International Individual Tax Matters Only two countries in the world tax this way; the other is Eritrea.
If your foreign financial accounts exceed $10,000 in aggregate value at any point during the year, you must also file a Report of Foreign Bank and Financial Accounts (FBAR) with the Financial Crimes Enforcement Network, separate from your tax return.12Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) The Foreign Account Tax Compliance Act separately requires foreign banks to report accounts held by Americans to the IRS.13Internal Revenue Service. Foreign Account Tax Compliance Act (FATCA) Penalties are steep. Even non-willful FBAR violations can run tens of thousands of dollars per account; willful violations can reach the greater of $100,000 or 50% of the account balance.
Selective Service
Male dual citizens between 18 and 25 must register with the Selective Service System within 30 days of turning 18, whether they live in the United States or abroad.14Selective Service System. Who Needs to Register Failing to register can cost you eligibility for federal student aid, federal job training, and most federal employment.15Selective Service System. Frequently Asked Questions
Consular Protection Has Limits
When you are physically in your other country of nationality, local authorities may not recognize your U.S. citizenship, especially if you entered on that country’s passport. The State Department warns that if you’re arrested there, officials may refuse to notify the U.S. embassy, and consular officers may be denied access to you.16U.S. Department of State. Dual Nationality The other country considers you its citizen and can assert jurisdiction on that basis. This matters most where mandatory military service, exit restrictions, or unfamiliar legal systems come into play.
Losing U.S. Citizenship Requires Voluntary Action
Under 8 U.S.C. § 1481, you can lose U.S. citizenship only by voluntarily performing a specific act with the intent to give it up. The statute lists seven expatriating acts:17Office of the Law Revision Counsel. 8 U.S. Code 1481 – Loss of Nationality by Native-Born or Naturalized Citizen
- Naturalizing in a foreign country after age 18
- Swearing allegiance to a foreign government after age 18
- Serving in a foreign military that is fighting the United States, or serving as a foreign military officer
- Working for a foreign government after age 18, if you hold or acquire that country’s nationality, or if the position requires an oath of allegiance
- Formally renouncing citizenship before a U.S. consular officer abroad
- Formally renouncing citizenship in writing within the United States during wartime, with the Attorney General’s approval
- Committing treason or attempting to overthrow the U.S. government by force, upon conviction
The word doing the work in that statute is “voluntarily.” In Vance v. Terrazas (1980), the Supreme Court held that the government must prove both that you committed an expatriating act and that you specifically intended to give up your citizenship when you did it.18Library of Congress. Vance v. Terrazas, 444 U.S. 252 (1980) Getting a foreign passport, voting in a foreign election, or naturalizing abroad does not cost you U.S. citizenship unless the government can show you meant it as renunciation. In practice, involuntary loss cases are almost never pursued. Holding two citizenships, on its own, doesn’t put your American one at risk.