Acquisition of Citizenship: A Guide for Children Born Outside the U.S.

Acquisition of citizenship is the process by which a child automatically becomes a U.S. citizen at birth, even if born outside the United States, because one or both parents are U.S. citizens.

This form of citizenship is granted by law. There is no need to apply for it through naturalization. However, the child may need to prove their status to get a U.S. passport or Certificate of Citizenship.

To acquire U.S. citizenship at birth, the child must meet specific requirements that depend on:

• The child’s birthdate
• The citizenship and residence history of the U.S. citizen parent(s)
• Whether the child was born in wedlock or out of wedlock

The law has changed over the years, so the rules depend on when the child was born.

Here’s how the process generally works:

1. A child is born outside the U.S.
2. At least one parent is a U.S. citizen at the time of birth.
3. That parent meets the physical presence requirements in the U.S. before the child's birth.
4. The child gains acquired citizenship at birth under U.S. law.

The child does not need to go through the naturalization process.

• Child with Two U.S. Citizen Parents

  
  At least one parent must have resided in the United States at any time before the child’s birth.

• Child with One U.S. Citizen Parent and One U.S. National Parent

  
  The U.S. citizen parent must have been physically present in the United States for a continuous period of at least one year before the child’s birth.

• Child with One U.S. Citizen Parent and One Foreign National Parent

  
  The U.S. citizen parent must have been physically present in the United States for at least 5 years, including at least 2 years after 14 years of age. Time abroad counts as physical presence in the United States if the time abroad was as a member of the U.S. armed forces in honorable status; under the employment of the U.S. government or other qualifying organizations; or as a dependent unmarried son or daughter of such persons.

• Child Born Out of Wedlock to a U.S. Citizen Mother

  
  The U.S. citizen mother must have been physically present in the United States for one continuous year before the child’s birth.

• Child Born Out of Wedlock to a U.S. Citizen Father

  
  The child is a citizen if all of the following conditions are met:
• A blood relationship between the child and the father is established by clear and convincing evidence;
• The child’s father was a U.S. citizen at the time of the child’s birth;
• The child’s father (unless deceased) has agreed in writing to provide financial support for the child until the child reaches 18 years of age; and
• One of the following criteria is met before the child reaches 18 years of age: (A) The child is legitimated under the law of their residence or domicile; (B) The father acknowledges in writing and under oath the paternity of the child; or (C) The paternity of the child is established by adjudication of a competent court.

Additional details and actual law can be reviewed at INA 301 and INA 309. For children born before November 14, 1986, the above rules will vary.

Again, this article only addresses U.S. citizenship through a parent that was an American citizen before the birth of the child. A child may also obtain citizenship through a parent after birth in a different process.

Following the Child Citizenship Act of 2000, adopted children may automatically acquire U.S. citizenship as of February 27, 2001. In order to receive this benefit, the child must:

• Have at least one U.S. citizen parent;
• Be under 18 years old;
• Reside permanently in the U.S. in the legal and physical custody of the U.S. citizen parent; and
• Be a lawful permanent resident of the United States.

If the adoption was finalized abroad, the child typically enters on an IR-3 visa, gaining citizenship upon entry. USCIS issues a Certificate of Citizenship within 45 days of arrival.

For adoptions not yet finalized abroad, the U.S. grants an IR-4 visa, and the child acquires citizenship on the date of readoption within the U.S.

The law is not retroactive. Children adopted, and already aged 18 or older as of February 27, 2001, do not qualify under this provision and must pursue citizenship through naturalization (Form N-400).

Even if a child automatically acquired U.S. citizenship at birth, it’s often important to obtain official proof. A Certificate of Citizenship provides documented evidence that the person is a U.S. citizen, especially valuable when applying for a passport, school, employment, or immigration benefits.

The best way to get this proof is by filing Form N-600, Application for Certificate of Citizenship with U.S. Citizenship and Immigration Services (USCIS).

Individuals who have acquired U.S. citizenship through a parent may file Form N-600 to make that claim and request a Certificate of Citizenship. You may file the application on behalf of a minor child, or an adult may file it for themselves if they acquired citizenship at birth. The form requires detailed information about:

• The applicant (the child or adult who acquired citizenship)
• The U.S. citizen parent(s)
• The family’s residence history
• How and when the child acquired U.S. citizenship

If USCIS approves the application, the applicant will receive a Certificate of Citizenship, which is official proof of their U.S. citizenship status.

To successfully file Form N-600, you’ll need to include supporting documentation that proves the child’s eligibility as well as the parent’s citizenship status and physical presence in the U.S.:

• Evidence of when the child was born and their relationship to the parent
• Proof of the parent’s U.S. citizenship
• Proof the parents were married at the time of the child's birth (if applicable)
• Evidence of the parent’s physical presence in the U.S. before the child’s birth
• Legal custody documents and/or evidence of legitimation (if applicable)

All documents not in English must include a certified translation.

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Understanding the laws related to acquisition of citizenship can be complex — especially since the rules depend on so many factors like birthdate, marital status, and physical presence.

CitizenPath makes the process easier. Our online service helps individuals prepare Form N-600 to request a Certificate of Citizenship. Our Citizenship Document Package is simple, affordable, and created by immigration attorneys. We also provide clear instructions, alerts for common errors, and personalized filing instructions.

Whether you're confirming a child's citizenship or applying for your own, our services can guide you through it.