Naturalization involves acquiring U.S. citizenship after birth, either through U.S. citizen parents or by meeting specific requirements and applying for naturalization. Typically, lawful permanent residents (green card holders) aged 18 or older can file for naturalization if they meet eligibility criteria. Most applicants are required to pass an English language and U.S. history and government test.

These general eligibility requirements specify that the applicant must:

To be eligible for naturalization, the candidate must meet the following criteria:

1. Hold a Green Card (The required time as a permanent resident varies by category).
2. Fulfill the designated wait time after the Green Card is issued in their category.
3. Be at least 18 years old.
4. Avoid trips of six months or longer outside the U.S. during the designated wait time before applying for naturalization.
5. Reside in the state of application for at least 3 months.
6. Demonstrate good moral character
7. Successfully complete the English language test and civics test.
8. Be willing to serve in the U.S. when called upon for national duty.
9. Commit to protecting the Constitution of the U.S.