Naturalization of Citizens in the United States: A Comprehensive Guide

Naturalization of Citizens in the United States: A Comprehensive Guide

Naturalization is the legal process through which a person who was not a U.S. citizen at birth becomes a citizen of the United States after satisfying requirements established by federal law. It is one of the principal ways in which lawful permanent residents can acquire U.S. citizenship after immigrating to the United States.

Unlike immigration itself, which may involve many different statuses and forms of authorization, naturalization results in a fundamental change in legal status. A person who becomes a naturalized U.S. citizen generally possesses the same rights and responsibilities as a person who was a U.S. citizen from birth, subject to the constitutional distinction concerning eligibility for the presidency.

Naturalization is governed primarily by federal law. The Constitution gives Congress the power to establish a uniform rule of naturalization, and Congress has exercised that authority principally through the Immigration and Nationality Act (INA). The U.S. Citizenship and Immigration Services (USCIS), a component of the Department of Homeland Security, administers the naturalization process.

Cornell Legal Information Institute: Naturalization

This article explains the legal foundations of U.S. naturalization, the principal eligibility requirements, the application and interview process, the citizenship test, the Oath of Allegiance, and the legal consequences of becoming a naturalized citizen.

Key Takeaways

• Naturalization is a federal legal process for obtaining U.S. citizenship after birth.
• Congress has constitutional authority to establish uniform naturalization rules.
• The most common applicants are lawful permanent residents, often called green-card holders.
• The standard naturalization pathway generally requires five years of lawful permanent residence, although important exceptions exist.
• A person married to and living in marital union with a U.S. citizen may qualify under a generally shorter three-year residence framework.
• Applicants must satisfy requirements concerning continuous residence, physical presence, residence in the relevant state or USCIS district, good moral character, English and civics knowledge, and attachment to constitutional principles.
• Naturalization generally involves filing Form N-400, background screening, an interview, English and civics testing where required, a USCIS decision, and the Oath of Allegiance.
• The exact civics-test version depends in part on when the applicant filed Form N-400. USCIS introduced a 2025 civics test for applicants who file on or after October 20, 2025.
• Naturalized citizens generally possess the same citizenship rights and responsibilities as citizens by birth, although the Constitution distinguishes naturalized citizens from natural-born citizens for purposes of presidential eligibility.
• Naturalization is different from acquisition of citizenship at birth and derivation of citizenship through a parent.

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What Is Naturalization?

Naturalization is the conferral of U.S. citizenship on a person after birth who was not already a U.S. citizen. Cornell’s Legal Information Institute describes naturalization as the conferral of citizenship after birth and explains that Congress exercises the constitutional naturalization power through federal legislation.

This definition is important because not every foreign-born person who becomes a U.S. citizen is naturalized.

There are several legally distinct ways a person may become a U.S. citizen.

A person may be:

1. A U.S. citizen at birth because they were born in the United States under the Citizenship Clause of the Fourteenth Amendment and applicable federal law;
2. A citizen at birth under federal statutory rules because of a U.S.-citizen parent;
3. A person who derives citizenship through a parent after certain statutory conditions are satisfied; or
4. A naturalized citizen who becomes a citizen through the naturalization process after birth.

These distinctions matter because the legal requirements and procedures are different.

Naturalization should therefore not be treated as simply another word for “becoming an American.” It is a specific statutory process governed by federal law.

Naturalization and Citizenship at Birth

The United States recognizes citizenship acquired at birth independently of naturalization.

The Fourteenth Amendment provides that persons born or naturalized in the United States and subject to its jurisdiction are citizens of the United States and of the state in which they reside. The constitutional rule concerning citizenship at birth is therefore conceptually separate from the statutory process of naturalization.

Cornell Legal Information Institute: Fourteenth Amendment

Federal law also provides circumstances in which a person born outside the United States may acquire citizenship through a U.S.-citizen parent. These rules are commonly described as acquisition of citizenship rather than naturalization.

Similarly, certain children may obtain citizenship automatically through a parent who becomes a naturalized U.S. citizen. This is generally referred to as derivation of citizenship and is governed by specific statutory requirements.

The distinction can be summarized simply:

Citizenship at birth → Acquisition → Derivation → Naturalization

These are related concepts, but they are not interchangeable legal processes.

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The Constitutional Foundation of Naturalization

The constitutional foundation of American naturalization is found in Article I, Section 8 of the U.S. Constitution.

Congress is granted the power:

“To establish an uniform Rule of Naturalization.”

This provision gives Congress the principal legislative authority over naturalization. States do not independently determine who may become a U.S. citizen through their own citizenship laws.

Congress exercised this constitutional authority through federal immigration and nationality legislation, principally the Immigration and Nationality Act.

The INA establishes the statutory framework governing naturalization, while federal regulations and USCIS procedures provide additional rules governing administration of the process.

Cornell’s explanation of the naturalization power emphasizes that Congress has the constitutional authority to create the rules governing naturalization and that the process must follow federal law.

Why Naturalization Is a Federal Process

Naturalization illustrates an important principle of American federalism.

A state may issue a driver’s license, conduct a marriage ceremony, or determine many matters of state law, but a state cannot independently confer U.S. citizenship through its own naturalization system.

U.S. citizenship is a matter of federal law.

This uniformity has historical importance. The Constitution’s naturalization clause was intended to prevent different states from creating conflicting rules concerning who could become a citizen of the United States.

As a result, naturalization applications are handled through the federal government rather than through state citizenship authorities.

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Who Can Apply for Naturalization?

The most common naturalization applicants are lawful permanent residents (LPRs).

A lawful permanent resident is a noncitizen who has been granted the right to live permanently in the United States, subject to the immigration laws governing maintenance and loss of that status. The permanent resident card is commonly called a green card.

The existence of permanent resident status, however, does not automatically lead to citizenship.

A lawful permanent resident may remain a permanent resident indefinitely without becoming a citizen, unless the person’s status is otherwise terminated under applicable law.

Naturalization is a separate legal process requiring the applicant to establish eligibility.

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General Eligibility Requirements for Naturalization

The standard naturalization pathway contains several important requirements. The exact requirements depend on the statutory basis under which the applicant applies, because special rules exist for certain categories of applicants.

The following requirements describe the general framework rather than every possible exception.

1. Minimum Age

An applicant generally must be at least 18 years old when Form N-400 is filed.

Children do not ordinarily naturalize through the standard adult N-400 process. Instead, separate statutory rules may allow children to acquire or derive citizenship through their parents.

2. Lawful Permanent Residence

The ordinary naturalization route generally requires the applicant to have been a lawful permanent resident for five years.

There are important exceptions.

For example, certain applicants who are married to and living in marital union with U.S. citizens may qualify under a three-year statutory framework rather than the ordinary five-year requirement.

Other special provisions apply to certain military personnel, spouses of U.S. citizens employed abroad, and other statutory categories.

The five-year rule should therefore be understood as the standard framework, not an absolute rule applicable to every applicant.

3. Continuous Residence

An applicant generally must establish continuous residence in the United States for the applicable statutory period before filing the naturalization application.

For the standard five-year route, this generally means continuous residence during the five years immediately preceding the application.

Continuous residence does not mean that the applicant can never leave the United States.

Instead, immigration law distinguishes between continuous residence and physical presence.

These are separate requirements.

4. Physical Presence

The applicant must also demonstrate sufficient physical presence in the United States.

Under the ordinary five-year rule, the applicant generally must have been physically present in the United States for at least 30 months during the five-year statutory period.

Physical presence is calculated differently from continuous residence.

For example, a person might maintain a residence in the United States while spending substantial periods abroad. Such travel can nevertheless affect the physical-presence requirement and, depending on its duration and circumstances, the continuous-residence requirement as well.

This is why international travel history can become an important part of a naturalization application.

5. Residence in the State or USCIS District

Naturalization law also contains a residence requirement connected to the state or USCIS district in which the applicant files.

USCIS identifies a general requirement that an applicant must have lived for at least three months in the state or USCIS district where the application is filed.

This requirement is separate from the broader continuous-residence requirement.

6. Good Moral Character

Applicants must establish good moral character for the period required by the naturalization statute.

Good moral character is a legal standard rather than a simple declaration that an applicant considers themselves to be a good person.

USCIS examines the applicant’s conduct and circumstances under the governing law.

Certain criminal conduct can create serious naturalization problems. Other conduct may also be relevant, including certain immigration violations, false statements, failure to meet legal obligations, or other conduct specified by federal law.

Importantly, good moral character is not limited mechanically to whether an applicant has a criminal conviction.

The analysis is fact-specific and governed by federal law.

7. English Language Requirement

Most applicants must demonstrate an ability to read, write, speak, and understand basic English.

There are statutory and regulatory exceptions and accommodations.

For example, certain applicants may qualify for exemptions or modified testing rules based on age and the length of time they have held lawful permanent resident status.

Applicants with qualifying disabilities may also receive accommodations or exemptions under applicable rules.

The English requirement should therefore be understood as a general rule subject to legally defined exceptions.

8. Knowledge of U.S. Government and History

Most applicants must also demonstrate knowledge of the fundamental principles and history of the United States through the naturalization civics test.

The test is administered as part of the naturalization process and is generally conducted orally by a USCIS officer.

The applicable test depends on when the applicant filed the N-400.

For applicants subject to the 2025 civics test, USCIS states that the officer asks up to 20 questions from a bank of 128 questions, and the applicant generally must answer at least 12 correctly to pass.

USCIS also provides special consideration for certain applicants who are at least 65 years old and have been lawful permanent residents for at least 20 years.

Because testing rules can change, applicants should use the version of the official USCIS materials applicable to their filing date rather than relying on older study materials.

9. Attachment to the Principles of the Constitution

Naturalization law also requires an applicant to demonstrate an attachment to the principles of the U.S. Constitution.

This requirement reflects the legal relationship between citizenship and the constitutional order of the United States.

It is not simply a requirement to memorize constitutional provisions. The naturalization process examines whether the applicant satisfies the statutory requirements concerning attachment to the constitutional principles of the United States.

10. Willingness to Take the Oath of Allegiance

Naturalization is completed through the Oath of Allegiance.

An applicant must generally be willing to take the oath and make the commitments required by federal law.

The oath is therefore not merely ceremonial. It is the formal legal act through which an approved applicant completes the naturalization process.

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Filing Form N-400

The standard application for naturalization is Form N-400, Application for Naturalization.

The application requires extensive information concerning the applicant’s identity, immigration history, residence, employment, travel, family relationships, and other matters relevant to statutory eligibility.

Applicants must provide truthful and complete information.

Naturalization applications are not simply applications for a document. USCIS uses the application and interview to determine whether the applicant satisfies the legal requirements for citizenship.

The applicable filing fee and filing procedures can change, so applicants should consult the current USCIS instructions when preparing an application.

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Background Checks and Biometrics

After an N-400 is filed, USCIS may require biometrics depending on the circumstances of the application.

USCIS explains that, when biometrics are required, the agency sends an appointment notice identifying the time and location of the appointment. Fingerprints may be transmitted for background-check purposes.

The purpose of this process is to allow the government to verify identity and conduct the required security and background screening.

Not every applicant will necessarily experience the process in exactly the same procedural sequence, so the applicant should follow the instructions contained in USCIS notices.

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The Naturalization Interview

The naturalization interview is one of the central stages of the process.

During the interview, a USCIS officer generally reviews the applicant’s Form N-400 and asks questions concerning the information contained in the application and the applicant’s background.

The applicant may also be required to complete the English and civics examinations.

USCIS describes the English examination as containing reading, writing, and speaking components, subject to applicable exemptions and accommodations.

The interview therefore serves several functions simultaneously.

It allows USCIS to:

• verify information submitted in the application;
• examine the applicant’s eligibility;
• assess English ability when required;
• administer the civics test when required;
• clarify discrepancies or incomplete information;
• evaluate relevant issues concerning good moral character and other statutory requirements; and
• determine whether the applicant has satisfied the requirements for naturalization.

Applicants should understand that the interview is not merely a formality.

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What Happens After the Interview?

USCIS may take several different actions after the interview.

The application may be:

Approved

If USCIS determines that the applicant has satisfied the legal requirements, the application may be approved.

Continued

USCIS may continue the application when additional evidence, documentation, testing, or another procedural step is required.

A continued application is not necessarily a final denial.

Denied

USCIS may deny the application if the applicant has failed to establish eligibility or another legal requirement has not been satisfied.

The consequences of a denial depend on the reason for the decision and the applicant’s circumstances. Federal immigration law provides procedures through which certain naturalization decisions can be reviewed or challenged.

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The Oath of Allegiance

Approval of Form N-400 does not mean that the applicant has completed every step of naturalization.

The final stage is the Oath of Allegiance.

At the naturalization ceremony, the applicant takes the oath required by federal law.

The oath represents the formal completion of the naturalization process.

After taking the oath, the person becomes a U.S. citizen through naturalization and receives evidence of citizenship, ordinarily a Certificate of Naturalization.

This distinction is important:

USCIS approval of the application is not the same legal event as completion of the naturalization process through the oath.

The oath is the final step that completes naturalization.

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The Certificate of Naturalization

A Certificate of Naturalization is official evidence that a person has become a U.S. citizen through naturalization.

It should be distinguished from a Certificate of Citizenship, which is generally used as evidence of citizenship acquired or derived under statutory rules rather than citizenship obtained through the ordinary naturalization process.

Cornell explains that a Certificate of Citizenship may be issued to individuals who obtained citizenship by operation of law while residing in the United States or who were born abroad to U.S.-citizen parents.

The distinction between these documents reflects the distinction between different legal paths to citizenship.

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Rights of Naturalized U.S. Citizens

Naturalization has profound legal consequences.

Once naturalization is complete, the person becomes a U.S. citizen rather than remaining a lawful permanent resident.

Naturalized citizens generally have the same citizenship rights and responsibilities as citizens by birth.

These include important rights such as:

• voting in federal elections when otherwise eligible;
• obtaining a U.S. passport;
• receiving the protection of U.S. citizenship while abroad;
• petitioning for certain qualifying relatives under the immigration laws;
• holding many forms of public employment and office that are restricted to citizens; and
• remaining in the United States without the immigration restrictions applicable to noncitizens.

Naturalized citizens also become subject to the legal duties associated with citizenship.

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Naturalized Citizens and Political Participation

Citizenship provides rights that lawful permanent residents generally do not possess.

One of the most significant is the right to participate in federal elections, subject to applicable election laws.

Naturalized citizens may also seek public offices for which citizenship is legally sufficient, although particular offices may have additional constitutional or statutory eligibility requirements.

The Constitution, for example, imposes a special requirement concerning the presidency.

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Naturalized Citizens and the Presidency

Naturalized citizens are citizens of the United States, but the Constitution distinguishes natural-born citizenship from naturalized citizenship in the context of presidential eligibility.

Article II provides that no person other than a natural-born citizen, or a citizen at the time of the Constitution’s adoption, is eligible to be President.

The exact constitutional meaning of “natural born citizen” has generated legal scholarship and litigation, particularly concerning persons born abroad to U.S.-citizen parents.

The important point for purposes of naturalization is straightforward:

Naturalization creates U.S. citizenship, but it does not make a person a “natural-born citizen” for constitutional purposes.

Cornell likewise identifies naturalized citizenship as distinct from citizenship acquired at birth and notes the presidential eligibility distinction.

Cornell Legal Information Institute: Natural Born Citizen

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Naturalization and Family Immigration

Naturalization can also affect a person’s ability to petition for qualifying relatives under U.S. immigration law.

U.S. citizens and lawful permanent residents have different family-based immigration categories and different statutory treatment.

Naturalization can therefore change the immigration options available to a person’s family members.

For example, U.S. citizens may petition for certain relatives under categories that are not available to lawful permanent residents, and some family relationships receive different treatment under the immigration preference system.

This does not mean that naturalization automatically gives every relative immigration status.

Family immigration remains governed by separate statutory requirements, visa availability rules, admissibility requirements, and procedural rules.

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Naturalization and International Travel

After naturalization, a person becomes eligible to apply for a U.S. passport.

Citizenship also changes the legal basis on which the person enters and leaves the United States.

A U.S. citizen generally has a fundamental right to remain in the United States that is fundamentally different from the immigration status of a lawful permanent resident.

A permanent resident can, under certain circumstances, lose status or become subject to removal proceedings.

A U.S. citizen is not subject to removal simply because an immigration status expires, because citizenship itself is not an immigration status.

This difference is one of the most important practical consequences of naturalization.

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Naturalization and Dual Citizenship

Naturalization does not necessarily require a person to cease being a citizen of another country.

Whether dual citizenship exists depends on the laws of the other country as well as U.S. law and the circumstances under which the person acquired each citizenship.

The United States may recognize circumstances in which a person possesses U.S. citizenship and another nationality simultaneously.

Naturalization applicants should therefore distinguish between:

• U.S. citizenship;
• nationality under another country’s law;
• the effect of U.S. law on foreign citizenship; and
• the effect of foreign law on the person’s continued nationality.

The consequences of dual nationality can vary substantially depending on the other country’s law.

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Can Naturalized Citizenship Be Lost?

Naturalization is a powerful legal status, but U.S. citizenship can in certain circumstances be lost or challenged.

Two concepts should be distinguished.

Renunciation

A U.S. citizen may seek to relinquish citizenship through a formal process governed by federal law.

Renunciation is not simply the act of moving permanently to another country or obtaining another nationality.

It involves specific legal procedures.

Denaturalization

The government may also seek denaturalization in circumstances authorized by federal law.

Denaturalization is fundamentally different from ordinary immigration enforcement against a noncitizen.

A lawful permanent resident can be placed in removal proceedings because of certain conduct or immigration violations.

A citizen generally cannot be removed from the United States on that basis.

But if citizenship itself was unlawfully obtained—for example, through legally sufficient fraud or concealment in the naturalization process—the government may in appropriate circumstances seek to have naturalization revoked through the procedures authorized by federal law.

Because denaturalization involves significant constitutional and statutory protections, it should not be confused with routine immigration enforcement.

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Naturalization Is Not Automatic After Permanent Residence

One of the most important misconceptions about U.S. immigration law is that a green card automatically turns into citizenship after a certain number of years.

It does not.

Lawful permanent residence and citizenship are separate legal statuses.

A permanent resident may remain a permanent resident without applying for naturalization.

If the person wants to become a U.S. citizen through naturalization, they generally must submit the required application and establish eligibility under federal law.

The five-year period therefore does not itself confer citizenship.

It generally establishes when an otherwise eligible permanent resident may qualify to apply.

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Early Filing of the Naturalization Application

Federal law allows certain applicants to file Form N-400 before completing the full statutory period of continuous residence.

USCIS generally permits eligible applicants under the ordinary five-year route to file up to 90 days before completing the required five-year continuous-residence period.

A similar 90-day early-filing rule generally applies to eligible applicants using the three-year provision for spouses of U.S. citizens.

Early filing does not eliminate the other naturalization requirements. USCIS expressly notes that applicants using the early-filing provision must still satisfy the other applicable requirements.

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Special Naturalization Rules

The five-year permanent-residence framework is not the only pathway to naturalization.

Federal law contains special provisions for certain applicants, including some:

• spouses of U.S. citizens;
• members of the U.S. armed forces;
• veterans;
• employees or contractors working abroad for qualifying U.S. entities;
• certain employees of nonprofit organizations;
• and other categories established by federal statute.

Military naturalization, for example, has historically been subject to special statutory rules that can differ substantially from the ordinary five-year civilian pathway.

Accordingly, someone who does not satisfy the ordinary five-year framework should not automatically conclude that naturalization is unavailable.

The relevant statutory category must be examined.

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The Role of USCIS

USCIS administers the naturalization process.

Its role includes receiving and adjudicating applications, conducting interviews, administering required testing, performing or coordinating background checks, and conducting naturalization ceremonies or arranging for them.

USCIS does not, however, create the basic citizenship requirements independently.

The agency administers federal law enacted by Congress.

This distinction is important because immigration agencies operate within statutory authority.

The legal foundation of naturalization comes from the Constitution and federal legislation, principally the INA, while USCIS provides the administrative mechanism for applying those rules.

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Naturalization and the Rule of Law

Naturalization illustrates the relationship between legislation, administrative agencies, and individual legal rights.

Congress establishes the statutory framework.

Federal regulations implement aspects of that framework.

USCIS administers the application process.

Applicants provide evidence demonstrating eligibility.

And federal law provides mechanisms for review of certain agency decisions.

Naturalization is therefore not simply an administrative formality. It is a legally structured process in which citizenship is conferred only after the applicant establishes that the statutory requirements have been satisfied.

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Common Misunderstandings About Naturalization

“Living in the United States for five years automatically makes someone a citizen.”

False.

Five years of permanent residence may satisfy part of the ordinary eligibility framework, but citizenship does not arise automatically.

The person generally must apply and satisfy all applicable requirements.

“Everyone who becomes a U.S. citizen through naturalization must have lived in the United States for exactly five years.”

False.

Five years is the standard rule, but statutory exceptions exist.

The three-year provision for certain spouses of U.S. citizens is one of the best-known examples.

Military and other special provisions can create additional pathways.

“A green card is the same as citizenship.”

False.

A lawful permanent resident remains a noncitizen.

Permanent residence provides important rights, but it is legally distinct from U.S. citizenship.

“Passing the English and civics tests means the applicant is automatically approved.”

False.

The tests are only part of the naturalization requirements.

USCIS must consider the application as a whole, including residence, physical presence, good moral character, immigration history, and other statutory requirements.

“Naturalization and acquisition of citizenship are the same.”

False.

A person can acquire U.S. citizenship at birth through a U.S.-citizen parent without undergoing naturalization.

Naturalization is a process that confers citizenship after birth.

“Naturalized citizens are second-class citizens.”

Legally, no.

Naturalized citizens generally possess the same rights and responsibilities of U.S. citizenship as citizens by birth.

The major constitutional distinction relevant to ordinary citizenship law concerns eligibility for the presidency and any other position for which the Constitution expressly imposes a citizenship-at-birth requirement.

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Frequently Asked Questions

What is naturalization in U.S. law?

Naturalization is the legal process by which an eligible person who was not a U.S. citizen at birth becomes a U.S. citizen after satisfying federal statutory requirements.

How long must a person have a green card before applying for naturalization?

The standard requirement is generally five years of lawful permanent residence. Certain applicants, including qualifying spouses of U.S. citizens, may use a three-year statutory framework.

Does lawful permanent residence automatically become citizenship?

No. A lawful permanent resident must generally apply for naturalization and establish eligibility.

What form is used to apply for naturalization?

The standard application is Form N-400, Application for Naturalization.

Is an interview required?

Generally, USCIS conducts a naturalization interview in which the officer reviews the application and background and administers required testing unless an applicable exemption or accommodation applies.

Is the civics test the same for every applicant?

Not necessarily. USCIS has different civics-test versions depending on the applicable filing date. Applicants should use the official USCIS materials applicable to their case. The 2025 version contains 128 questions, with up to 20 asked during the examination for applicants subject to that version.

What happens after USCIS approves the application?

The applicant must complete the naturalization process by taking the Oath of Allegiance at a naturalization ceremony, unless a legally applicable alternative procedure applies.

Are naturalized citizens U.S. citizens in the same way as citizens by birth?

Naturalized citizens are U.S. citizens and generally possess the same citizenship rights and responsibilities. The Constitution nevertheless distinguishes naturalized citizens from natural-born citizens for purposes such as presidential eligibility.

Can a naturalized citizen lose U.S. citizenship?

Citizenship can be relinquished through a legally recognized renunciation process, and naturalization can in certain circumstances be challenged through denaturalization proceedings. These are exceptional legal processes and should not be confused with ordinary immigration enforcement.

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Conclusion

Naturalization is one of the most significant legal transitions recognized by U.S. immigration and nationality law. It transforms an eligible noncitizen—most commonly a lawful permanent resident—into a U.S. citizen through a federally regulated process.

The process is grounded in the Constitution’s grant of naturalization authority to Congress and implemented principally through the Immigration and Nationality Act. USCIS administers the application process, but the underlying citizenship requirements come from federal law.

For most applicants, naturalization involves a combination of lawful permanent residence, continuous residence, physical presence, state or district residence, good moral character, English and civics requirements, attachment to constitutional principles, and the Oath of Allegiance. Special statutory provisions can modify these requirements for particular categories of applicants.

Naturalization should also be distinguished carefully from citizenship acquired at birth, citizenship acquired through a U.S.-citizen parent, and citizenship derived through a parent after the parent naturalizes.

Ultimately, naturalization is not simply the issuance of another immigration document. It is the legal process through which a person becomes a member of the American political community as a U.S. citizen, with the rights, responsibilities, and constitutional status that citizenship entails.

This article provides general information about U.S. law and is not a substitute for individualized legal advice. Naturalization eligibility can depend on detailed facts concerning immigration history, travel, residence, criminal or other conduct, family relationships, military service, and statutory exceptions.