Who Can Apply for U.S. Citizenship

!Collage of images from a citizenship ceremony with people taking oaths and U.S. flags

U.S. citizenship gives a person as many rights as the United States has to offer. This includes, for example, the rights to:

vote in U.S. state and federal elections
petition for family members to immigrate to the United States, and
live in another country without losing the right to return.

For these reasons, naturalized U.S. citizenship is not easy to obtain. (For the law on who is eligible, see 8 U.S.C. § 1427.)

Unless you are among the lucky few foreign nationals who qualify automatically for U.S. Citizenship by Birth or Through Parents, you will need to apply to become a U.S. citizen through a process known as naturalization. Before turning in your N-400 application to U.S. Citizenship and Immigration Services (USCIS), however, you must first have held a green card (lawful permanent residence) for a number of years and meet other eligibility requirements, as we discuss below.

In This Article

Basic Eligibility Criteria for Naturalized U.S. Citizenship

If you are a green card holder who is interested in applying for U.S. citizenship, first make sure that all of the following apply to you:

You have had lawful permanent resident status for at least five years (with exceptions for refugees, people who got their green card through asylum, spouses of U.S. citizens, and U.S. military personnel). For details, see When Can I Apply for U.S. Citizenship?
You have lived within the United States continuously for the five years preceding your application, and during that you have not spent more than one continuous year outside the United States. For details, see How Absences From the U.S. Affect Eligibility for U.S. Citizenship.
You have been physically present in the United States for at least half of the five years before filing your N-400 application. Also see How Absences From the U.S. Affect Eligibility for U.S. Citizenship.
You have lived in the district or state where you are filing your application for at least three months before filing your N-400. Also see How Absences From the U.S. Affect Eligibility for U.S. Citizenship.
You are at least 18 years old at the time of filing.
You have good moral character, for example you haven't committed any crimes, failed to pay taxes or child support, and so on, at least for the five years leading up to submitting your N-400 (or fewer years if you qualify for an early-filing exception). See When Proof of Good Moral Character Helps an Immigration Application—Or Doesn't and FAQs About Citizenship Bars and Eligibility Problems and FAQs About Meeting Good Moral Character Requirement for Naturalized U.S. Citizenship.
You are willing to swear an oath of allegiance saying that you believe in the principles of the U.S. Constitution and will be loyal to the United States (with modifications and exceptions in certain circumstances) and give up your foreign throne (in the unlikely event that you have one). See FAQs About Taking Oath of U.S. Citizenship.

caution Applying for naturalized U.S. citizenship opens your whole immigration history up to review. This is not a risk-free process. USCIS will take your fingerprints and carefully investigate your background. If it discovers something wrong—for example, that you used fraud to get your green card in the first place, you abandoned your U.S. residency by making your home outside the United States, or even that you failed to advise it of your new address within 10 days of moving—it can send you to deportation (removal) proceedings, where a judge can strip you of your green card and send you out of the country.

Tests You'll Need to Pass to Become a Naturalized U.S. Citizen

After submitting your citizenship application (as described below), you will also need to be ready to pass two exams. These will be held during your citizenship interview, at a USCIS office. They are meant to test whether:

You are able to speak, read, and write in English (with exceptions for certain long-term residents over a certain age with lengthy residences in the United States, and persons with certain medical disabilities). See Tests You Will Need to Pass to Become a U.S. Citizen.
You are able to pass a test covering U.S. history and government (with exceptions for senior citizens, as described in the links above, and for persons with certain medical disabilities).

If you don't pass one or both of these tests the first time, you will normally get one more chance to appear for a USCIS interview and try again. This second interview will typically be scheduled for a date within 60 to 90 days of the first interview.

Summary of the Application Process for Naturalized U.S. Citizenship

In order to apply for naturalized citizenship, you will need to complete an application on USCIS Form N-400 (see Filling Out USCIS Form N-400) and send it in with a copy of your green card and the appropriate fee (or else a request for a fee waiver, as described in Can You Request Fee Waiver or Reduction When Applying for Naturalized Citizenship on Form N-400?).

After filing your N-400 application, you will probably wait many months, depending on backlogs at your local USCIS office. First, you will be called in for a fingerprint (biometrics) appointment, and later an interview appointment.

At the citizenship interview, a USCIS officer will test your English language ability (unless you fit within an exception) as well as your knowledge of U.S. history and government. Normally this means you will have to study a list of 128 questions and be ready to answer at least 12 out of 20 of them. However, there's a shorter list of possible questions if you are 65 or older and you have been a permanent resident of the U.S. for at least 20 years.

Applicants who are disabled can ask for accommodations at the interview, such as a sign language interpreter or wheelchair accessibility. In order to make advance arrangements, you'll contact USCIS in accordance with its online instructions.

If you don't pass the English or history/government exams, you will automatically receive a second chance. USCIS will schedule you for a second interview within 90 days of the first one. (See Second Chances If Naturalization Not Approved at First USCIS Interview.)

If all goes well at your naturalization interview, you will receive an appointment for your swearing-in (oath) ceremony. This might be held at the USCIS office (which tends to be a faster option) or in a courtroom or at a large ceremony. At that time, you actually become a U.S. citizen, and receive a certificate of naturalization to prove it.

As a U.S. citizen, you can petition to have close family members join you in the United States. For details, see Green Cards for Your Family: Sponsorship Rules.

Further Resources About U.S. Citizenship

For more on the naturalization eligibility and application requirements, including important exceptions, the rights of senior citizens or disabled persons, and the details of how to prepare and submit your application and get ready for the interview, see, Becoming a U.S. Citizen: A Guide to the Law, Exam & Interview, by Ilona Bray (Nolo).

And if you think you might want professional help, or are worried about complications in your case, also see When Do You Need an Immigration Lawyer?.