What is the purpose of Form N-400?

Form N-400 serves as the application for naturalization, which is the process through which a non-citizen can become a U.S. citizen. This form is critical for individuals who meet the eligibility requirements for naturalization, as it initiates the legal process to gain citizenship. The N-400 requires applicants to provide detailed personal information, demonstrate their ability to read, write, and speak English, and show knowledge of U.S. history and government.

The form also verifies the applicant's adherence to the principles of the U.S. Constitution and their willingness to take an Oath of Allegiance. Thus, its primary purpose is to facilitate the transition from a lawful permanent resident to a fully recognized citizen of the United States. This is essential for those who have fulfilled the requisite residency period and other conditions mandated by immigration laws.