Definition
Naturalization is the federal legal process by which a lawful permanent resident of the United States voluntarily becomes a U.S. citizen after meeting the requirements established by immigration law. It is administered by U.S. Citizenship and Immigration Services (USCIS) and typically involves filing an application, attending an interview, passing English and civics tests, and taking an oath of allegiance. Because citizenship is governed entirely by federal law, the requirements are uniform across all states.
Legal Meaning
Citizenship in the United States is acquired in two principal ways: by birth (including birth in the country or, in many cases, to U.S. citizen parents abroad) or by naturalization. Naturalization is the path for people who were not born citizens, and in the typical case it is available only to those who already hold lawful permanent resident status—commonly known as having a green card. Naturalization is a federal process, so the eligibility rules and procedures do not vary from state to state.
The law sets out several core requirements that an applicant must generally satisfy. These include being a permanent resident for a required period, meeting continuous-residence and physical-presence standards, being a person of "good moral character," demonstrating a basic ability to read, write, and speak English, passing a civics test covering U.S. history and government, and taking an oath of allegiance to the United States. Special provisions can shorten or modify these requirements for certain applicants, such as some spouses of U.S. citizens and certain members of the armed forces.
Naturalization is significant because U.S. citizens enjoy rights and protections that permanent residents do not. Citizens can vote in federal elections, obtain a U.S. passport, sponsor a broader range of relatives for immigration, and are generally protected from deportation. Conversely, even long-term permanent residents can, in some circumstances, face removal, which is one reason many eligible residents choose to naturalize. For how removal works, see our related term on deportation.
Key Points
- Naturalization is a federal process administered by USCIS, with uniform rules nationwide
- Applicants are generally lawful permanent residents (green card holders) first
- The permanent-residence requirement is usually five years, or three years for certain spouses of U.S. citizens
- Applicants must meet continuous-residence and physical-presence requirements
- Good moral character during the relevant period is required, and certain conduct can disqualify an applicant
- Most applicants must show basic English ability and pass a civics test on U.S. history and government
- The process ends with an oath of allegiance to the United States
- Citizenship grants rights permanent residents lack, including voting and protection from deportation
Real-World Example
Luis has been a lawful permanent resident for six years, has lived continuously in the United States, has filed his taxes, and has no disqualifying criminal history. Believing he meets the requirements, he files an application for naturalization with USCIS.
After submitting his application and biometrics, Luis is scheduled for an interview with a USCIS officer. The officer reviews his application, asks about his background and good moral character, and administers the English and civics tests. Luis answers the civics questions correctly and demonstrates his English ability. Once approved, he attends a ceremony where he takes the oath of allegiance and receives a Certificate of Naturalization, officially becoming a U.S. citizen with the right to vote and apply for a U.S. passport.
Common Naturalization Requirements at a Glance
| Requirement | General Standard | Notes |
|---|---|---|
| Permanent Residence | Generally 5 years (3 for certain spouses) | Measured from the date of becoming a permanent resident |
| Continuous Residence | Maintained throughout the required period | Long trips abroad can disrupt it |
| Physical Presence | Present in the U.S. for a portion of the period | Counted in days within the relevant years |
| Good Moral Character | Required during the statutory period | Certain crimes and conduct can disqualify |
| English Ability | Basic reading, writing, and speaking | Exemptions for some older, long-term residents |
| Civics Knowledge | Pass a test on U.S. history and government | Accommodations available for qualifying disabilities |
| Oath of Allegiance | Required at a naturalization ceremony | Final step before citizenship is granted |
The Naturalization Process
The process begins when an eligible permanent resident files the naturalization application with USCIS. After filing, the applicant typically attends a biometrics appointment, where fingerprints and identifying information are collected for background checks. USCIS then schedules an interview, at which an officer reviews the application, asks questions to confirm eligibility and good moral character, and administers the English and civics tests unless an exemption applies.
If the application is approved, the final step is taking the oath of allegiance at a naturalization ceremony, after which the new citizen receives a Certificate of Naturalization. If problems arise—such as questions about continuous residence, good moral character, or test results—USCIS may continue the case, request more evidence, or deny the application, and an applicant generally has the right to request a review of a denial. Because the consequences and timelines matter, applicants should be careful and complete; the broader idea of meeting legal deadlines is discussed in our term on the statute of limitations.
Related Terms
Ready to Become a Citizen?
An immigration attorney can confirm your eligibility, review your history, and guide you through naturalization
Explore Immigration HelpWhen You Need a Lawyer
Many people naturalize on their own, but professional guidance can prevent costly mistakes. You should consider consulting an immigration attorney if:
- You have any criminal history, even old or minor offenses, that could affect good moral character
- You have spent extended time outside the United States and are unsure about continuous residence
- You have had prior immigration violations, removal proceedings, or problems with a previous application
- You qualify under a special provision, such as military service or marriage to a U.S. citizen, and want to confirm eligibility
- Your application was denied and you want to seek review
Reputable nonprofit organizations and legal aid programs also offer low-cost naturalization assistance, and using a qualified provider helps avoid errors that can delay or jeopardize citizenship.
Frequently Asked Questions
What is naturalization?
Naturalization is the federal legal process by which a lawful permanent resident, often called a green card holder, voluntarily becomes a United States citizen after meeting the requirements set by immigration law. It is administered by U.S. Citizenship and Immigration Services and generally involves an application, an interview, English and civics tests, and an oath of allegiance. Because citizenship is a federal matter, the rules are the same in every state.
What are the basic requirements to naturalize?
Common requirements include being a lawful permanent resident for a required period (generally five years, or three years for certain spouses of U.S. citizens), meeting continuous residence and physical presence rules, being a person of good moral character, demonstrating a basic ability to read, write, and speak English, passing a civics test on U.S. history and government, and taking an oath of allegiance. Some applicants qualify under special provisions, such as certain members of the military.
What does good moral character mean for naturalization?
Good moral character is a requirement that an applicant has generally behaved in a manner that meets the standards of average citizens during the relevant period before applying. Certain conduct, such as some criminal convictions, fraud, or failure to pay taxes or support obligations, can show a lack of good moral character and may bar or delay naturalization. Whether a particular issue is disqualifying depends on the facts and the law.
Do I have to take a test to become a citizen?
In most cases, yes. Applicants generally must demonstrate a basic ability to read, write, and speak English and must pass a civics test on U.S. history and government, both typically administered during the naturalization interview. There are exemptions and accommodations for some older, long-term residents and for applicants with qualifying disabilities, but most applicants must satisfy these requirements.
How is naturalization different from getting a green card?
A green card grants lawful permanent residence, allowing a person to live and work in the United States indefinitely, but it does not make them a citizen. Naturalization is the later step that turns a permanent resident into a U.S. citizen, granting additional rights such as the ability to vote, hold a U.S. passport, and generally protection from deportation. Naturalization typically requires holding a green card for a set period first.
Finding Immigration Help
Naturalization can surface complex history, so choosing the right help matters. For assistance locating qualified immigration counsel, see our resources: