Form N-400 (Application for Naturalization)

Form N-400 is the application filed by lawful permanent residents who wish to become U.S. citizens through the naturalization process. To be eligible, the applicant must meet certain residency, physical presence, and good moral character requirements, as well as demonstrate knowledge of English and U.S. civics. The form requires the applicant to provide extensive personal information, as well as evidence of their eligibility for naturalization. Once the application is approved, the applicant must take the Oath of Allegiance to complete the process.