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Pathway

U.S. Citizenship Through Parent After Birth

United States Citizenship
Pathway overview

At a glance

Some people born outside the United States became U.S. citizens after birth as children when they lived in the United States as lawful permanent residents in the legal and physical custody of a U.S. citizen parent.

Type
Derivative citizenship
Family line
Child of a U.S. citizen parent
Core records
Proof of the parent's citizenship, the child's lawful permanent residence, custody, and residence
What to know
Often a strong right if the childhood facts line up
What it gives
If the conditions were met, the person can seek evidence of existing citizenship through a U.S. passport or Form N-600 Certificate of Citizenship.
Main limit
This is not citizenship at birth abroad, and it is not ordinary naturalization.

Summary

Some people born outside the United States automatically became U.S. citizens while they were children. Under the modern rule in INA 320, this usually happened when, before age 18, the child was a lawful permanent resident living in the United States in the legal and physical custody of a U.S. citizen parent.

The citizenship occurs automatically when all requirements exist at the same time. A passport or Certificate of Citizenship proves the event; it does not create citizenship.

Pathway fit check

Eligibility

For INA 320, generally confirm that, at one point on or after February 27, 2001 and before the person's 18th birthday:

The requirements can be met in any order, but they must overlap before age 18. People who turned 18 before February 27, 2001 must be evaluated under the earlier law. Stepchildren do not acquire citizenship through a stepparent under this provision unless an adoption creates a qualifying relationship.

What This Route Allows

If the conditions were met, the person can seek evidence of existing citizenship through a U.S. passport or Form N-600 Certificate of Citizenship. Citizenship does not expire, although passports and other proof documents do.

The route can include qualifying adopted children, but adoption timing, legal custody, immigration classification, and finality of the adoption can change the analysis.

What This Route Is Not

This is not citizenship at birth abroad, and it is not ordinary naturalization. It also does not cover every child of a U.S. citizen who lives outside the United States.

A child residing abroad who did not automatically acquire citizenship may instead have an application-based route under INA 322. That process generally must be completed before age 18 and may use qualifying physical presence of a U.S. citizen parent or, in some cases, grandparent. It usually requires the child to be lawfully present in the United States for the interview and oath, with special rules for children of U.S. military members. INA 322 citizenship is not automatic merely because the family appears eligible.

Next Steps

  1. Create a dated timeline for the child's birth, the parent's citizenship, lawful permanent residence, U.S. residence, custody, adoption events, and 18th birthday.
  2. Gather the green card or immigrant-admission record, the parent's citizenship proof, birth or adoption records, custody orders, and records showing shared U.S. residence.
  3. Determine whether INA 320, an older derivative-citizenship law, or the INA 322 process applies.
  4. Choose the appropriate proof process: passport, Form N-600, or—only for an eligible child residing abroad—Form N-600K.
  5. Do not file Form N-400 for ordinary naturalization if the person may already be a citizen.
Compare your options

Other routes in United States.

Sources