What is the U.S. Constitution?

The U.S. Constitution is the foundational legal document of the United States — the supreme law of the land. It was drafted in 1787 at the Constitutional Convention in Philadelphia and ratified by the states in 1788, taking effect on March 4, 1789. The Constitution establishes the federal government's structure (with three branches — legislative, executive, and judicial), defines and limits government powers, protects basic individual rights (especially through the Bill of Rights and later amendments), and provides a process for amendment. The original Constitution has seven Articles, and 27 amendments have been added since ratification, with the first 10 (the Bill of Rights) ratified in 1791. On the citizenship test, candidates are expected to know what the Constitution does, that it is the supreme law of the land, and several specific facts about its content and creation.

What is an amendment to the Constitution?

An amendment is a formal change or addition to the U.S. Constitution. The Constitution can be amended through Article V's procedures: an amendment must be proposed by either a two-thirds vote in both chambers of Congress (the only method used so far) or by a constitutional convention called by two-thirds of state legislatures (never used), and then ratified by either three-fourths of state legislatures or conventions in three-fourths of states. As of today, 27 amendments have been ratified — the first 10 in 1791 (the Bill of Rights) and the most recent in 1992 (the 27th Amendment, regarding congressional pay). The amendment process is intentionally difficult so the Constitution is not changed lightly. On the citizenship test, "What is an amendment?" is answered with "a change (to the Constitution)" or "an addition (to the Constitution)."

How many Articles does the original Constitution have?

The original U.S. Constitution has seven Articles. Article I establishes the legislative branch (Congress). Article II establishes the executive branch (the President). Article III establishes the judicial branch (the Supreme Court and other federal courts). Article IV addresses relations among the states (full faith and credit, extradition, admission of new states). Article V describes the process for amending the Constitution. Article VI declares the Constitution to be the supreme law of the land and requires officials to swear an oath to support it. Article VII specified that the Constitution would take effect when ratified by nine of the original thirteen states. The first three Articles establish the three branches of government and remain the most-cited parts of the Constitution. While the citizenship test typically doesn't ask "How many Articles are in the Constitution?" directly, the structure underlies many test questions about how the federal government works.

When was the U.S. Constitution written?

The U.S. Constitution was written in 1787 at the Constitutional Convention in Philadelphia, Pennsylvania. The Convention met from May to September 1787, with 55 delegates from 12 of the 13 states (Rhode Island did not send delegates). George Washington presided over the Convention. The Constitution was then sent to the states for ratification, and was ratified by the ninth state (New Hampshire) on June 21, 1788, allowing it to take effect. The new federal government under the Constitution began operating on March 4, 1789, with George Washington's inauguration as the first President. The Bill of Rights — the first 10 amendments — was ratified by enough states to take effect on December 15, 1791. On the citizenship test, the question "When was the Constitution written?" is answered with "1787."

U.S. Constitution Citizenship Test Guide — Key Concepts (2026)

TL;DR

The U.S. Constitution is the supreme law of the land in the United States — the foundational document that establishes the federal government, defines its powers, limits it, and guarantees individual rights. Ratified in 1788, the Constitution begins with the Preamble (which starts with the famous words "We the People"), then has seven Articles that establish the structure of government, plus 27 amendments added since ratification. The first 10 amendments, ratified in 1791, are the Bill of Rights. On the U.S. citizenship test, candidates are expected to know what the Constitution does, what the supreme law of the land is, the first three words of the Preamble, the meaning of "We the People," when the Constitution was written (1787) and ratified (1788), and the function of the Articles. Several civics test questions specifically reference the Constitution, making this one of the most important topics to master.

Note on test versions: Your civics-test version depends on your Form N-400 filing date. Applicants who filed before October 20, 2025 generally take the 2008 civics test (100-question pool, 10 asked, 6 correct to pass); applicants who filed on or after October 20, 2025 take the 2025 civics test (128-question pool, 20 asked, 12 correct to pass). Under both versions, the 65/20 rule offers a simplified civics test (10 designated questions, 6 correct to pass) for applicants 65 years or older who have lived in the U.S. as permanent residents for 20+ years. The Constitution concepts in this guide are useful for both versions, but exact question wording and question counts may differ.

What the Constitution Does

The U.S. Constitution is the founding legal document of the United States. It was drafted in 1787 at the Constitutional Convention in Philadelphia and ratified by the states in 1788. It became effective on March 4, 1789. The Constitution does several essential things:

Establishes the federal government — it creates the legislative, executive, and judicial branches
Defines the powers of each branch (separation of powers)
Limits government power — only powers listed in the Constitution belong to the federal government
Protects basic rights — initially through implied limits, later through the Bill of Rights and other amendments
Provides a way to change — through the amendment process
Establishes federalism — divides power between the federal government and the states

The citizenship test asks "What does the Constitution do?" — acceptable answers include: sets up the government, defines the government, protects basic rights of Americans.

"Supreme Law of the Land"

The Constitution is officially the supreme law of the land. This means:

All federal, state, and local laws must comply with the Constitution
If a law conflicts with the Constitution, the Constitution wins
The Supreme Court has the final say on what the Constitution means
No government official, including the President, is above the Constitution

The phrase "supreme law of the land" comes from Article VI of the Constitution itself, which states that the Constitution, federal laws made under it, and treaties shall be the supreme law of the land.

The citizenship test asks "What is the supreme law of the land?" — the answer is the Constitution.

The Preamble: "We the People"

The Constitution begins with a single, famous sentence called the Preamble:

"We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America."

The Preamble does NOT grant any specific powers — it states the purposes of the Constitution. It identifies "We the People" as the source of governmental authority, not a king, not a legislature, not the states alone.

Key citizenship test concepts from the Preamble:

The first three words are "We the People." This phrase appears multiple times on the citizenship test.
The phrase represents the principle of self-government — the people are the source of governmental authority.
The Preamble lists the purposes of the Constitution: forming a "more perfect Union," establishing justice, ensuring domestic tranquility, providing for the common defense, promoting the general welfare, and securing the blessings of liberty.

The citizenship test asks "The idea of self-government is in the first three words of the Constitution. What are these words?" — the answer is We the People.

The Seven Articles of the Constitution

The original Constitution has seven articles:

Article I — Legislative Branch (Congress)

Establishes the U.S. Congress (the Senate and House of Representatives), describes who can serve, and lists the powers of Congress (such as taxation, commerce regulation, declaring war, and admitting new states). Also lists certain powers Congress is denied.

Article II — Executive Branch (President)

Establishes the office of President of the United States, describes how the President is elected (the Electoral College), and lists the President's powers (Commander in Chief, treaty negotiation, appointments, vetoes, etc.).

Article III — Judicial Branch (Federal Courts)

Establishes the Supreme Court and authorizes Congress to establish lower federal courts. Describes the jurisdiction of federal courts and defines treason (one of the few crimes specifically defined in the Constitution).

Article IV — Relations Among the States

Requires states to give "Full Faith and Credit" to other states' laws and judicial decisions, requires states to extradite fugitives, and addresses the admission of new states. Also includes the "Privileges and Immunities" clause requiring states to treat citizens of other states fairly.

Article V — The Amendment Process

Describes how the Constitution can be amended. There are two methods of proposing amendments and two methods of ratifying them, but only one method has been used so far: proposed by two-thirds of both chambers of Congress, ratified by three-fourths of state legislatures.

Article VI — Federal Power and the Supremacy Clause

Establishes that the Constitution, federal laws, and treaties are the supreme law of the land. Also includes the requirement that all federal and state officials swear an oath to support the Constitution, and prohibits any religious test for federal office.

Article VII — Ratification

Specified that the Constitution would take effect when ratified by nine of the original thirteen states. (Today, this article is mostly historical.)

The Amendment Process

The Constitution can be amended — formally changed — through Article V's procedures. Amendments require:

Proposal by either:
- Two-thirds vote in both chambers of Congress (this is the only method used so far), OR
- A constitutional convention called by two-thirds of state legislatures (never used)
Ratification by either:
- Three-fourths of state legislatures, OR
- Conventions in three-fourths of states (used only for the 21st Amendment)

The amendment process is intentionally difficult to ensure the Constitution isn't changed lightly. As of today, 27 amendments have been ratified out of thousands proposed.

Key amendments that often appear on the citizenship test:

1st through 10th amendments = Bill of Rights (1791)
13th Amendment = Abolished slavery (1865)
14th Amendment = Birthright citizenship and equal protection (1868)
15th Amendment = Right to vote regardless of race (1870)
19th Amendment = Women's right to vote (1920)
26th Amendment = Voting age lowered to 18 (1971)

When the Constitution Was Written and Ratified

Important dates for the citizenship test:

1787 — The Constitution was written at the Constitutional Convention in Philadelphia.
1788 — The Constitution was ratified when the ninth state (New Hampshire) approved it.
1789 — The Constitution took effect, and the first U.S. government under it was established.
1791 — The Bill of Rights (first 10 amendments) was ratified.

The citizenship test asks "When was the Constitution written?" — the answer is 1787.

The Constitutional Convention

The Constitution was drafted at a meeting in Philadelphia in 1787 called the Constitutional Convention. 55 delegates from 12 of the 13 states attended (Rhode Island didn't send delegates).

Key figures from the Convention often appear on the citizenship test:

George Washington — President of the Convention; later first U.S. President. The "Father of Our Country."
James Madison — Often called the "Father of the Constitution" because he kept detailed notes and drove much of the structure. He later became the 4th U.S. President.
Benjamin Franklin — Oldest delegate; statesman and diplomat. The citizenship test specifically asks about Franklin.
Alexander Hamilton — Co-author of the Federalist Papers; later Treasury Secretary.

The Federalist Papers

The Federalist Papers were a series of 85 essays written by James Madison, Alexander Hamilton, and John Jay between 1787 and 1788, urging ratification of the Constitution. They are among the most influential historical explanations of the Constitution's meaning and remain influential in modern Supreme Court interpretation.

The citizenship test asks: "The Federalist Papers supported the passage of the U.S. Constitution. Name one of the writers." — Madison, Hamilton, or Jay (or "Publius," the pen name they collectively used).

Constitutional Concepts on the Citizenship Test

Federalism

Federalism is the division of power between the federal government and state governments. The Constitution gives certain powers to the federal government (like declaring war and printing money), reserves other powers to the states (like education and police), and grants some shared powers to both (like collecting taxes).

The 10th Amendment makes federalism explicit: powers not given to the federal government and not prohibited to the states are reserved to the states or the people.

Republican Form of Government

The Constitution guarantees each state a "Republican Form of Government," meaning a representative democracy where citizens elect representatives to make laws. The U.S. is a constitutional republic — meaning representatives are bound by the Constitution.

Rule of Law

The principle that everyone — including elected officials — is subject to the law. No one is above the law, and laws apply equally to everyone. The Constitution establishes the rule of law in the U.S. system.

Common Citizenship Test Questions

The questions and answers below are drawn from the 2008 100-question list (still used for applicants who filed before October 20, 2025). The 2025 civics test draws from a different 128-question pool and asks more questions, but Constitution concepts overlap heavily. Here are the most-tested questions about the Constitution in the 2008 pool:

Q: What is the supreme law of the land?

A: The Constitution.

Q: What does the Constitution do?

A: Sets up the government, defines the government, protects basic rights of Americans.

Q: The idea of self-government is in the first three words of the Constitution. What are these words?

A: We the People.

Q: What is an amendment?

A: A change (to the Constitution); an addition (to the Constitution).

Q: What do we call the first ten amendments to the Constitution?

A: The Bill of Rights.

Q: How many amendments does the Constitution have?

A: 27.

Q: When was the Constitution written?

A: 1787.

Q: The Federalist Papers supported the passage of the U.S. Constitution. Name one of the writers.

A: (James) Madison, (Alexander) Hamilton, (John) Jay, or Publius.

Q: What is one thing Benjamin Franklin is famous for?

A: U.S. diplomat; oldest member of the Constitutional Convention; first Postmaster General of the United States; writer of "Poor Richard's Almanac"; started the first free libraries.

Q: There were 13 original states. Name three.

A: New Hampshire, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, North Carolina, South Carolina, Georgia. (Any three.)

Common Misconceptions

"The Constitution gives Americans their rights." Misleading. The framers' view was that Americans already have natural rights as humans; the Constitution protects those rights from government infringement and limits what the government can do.
"The Constitution can't be changed." False. The Constitution can be amended through Article V's procedures. It has been amended 27 times. The process is intentionally difficult, but not impossible.
"The President can ignore the Constitution if there's an emergency." False. The Constitution applies in all circumstances. While some constitutional rules may be temporarily suspended (like habeas corpus during certain emergencies), the Constitution itself remains in force, and the Supreme Court continues to interpret it.
"The Constitution is a religious document." False. The Constitution is a secular document that establishes a separation between government and religion. Article VI specifically prohibits any religious test for federal office, and the First Amendment guarantees freedom of religion.
"State constitutions can override the U.S. Constitution." False. The U.S. Constitution is the supreme law of the land. State constitutions, state laws, and local laws all must comply with the U.S. Constitution. State constitutions can provide broader protections than the federal Constitution, but state law cannot take away federally protected constitutional rights.

Common Test Patterns

Pattern 1: Supreme law identification "What is the supreme law of the land?" → The Constitution.

Pattern 2: Function of the Constitution "What does the Constitution do?" → Sets up the government, defines the government, protects basic rights of Americans (any acceptable).

Pattern 3: Preamble first three words "What are the first three words of the Constitution?" → We the People.

Pattern 4: Amendments "How many amendments does the Constitution have?" → 27. "What are the first 10 amendments called?" → The Bill of Rights.

Pattern 5: Definition of amendment "What is an amendment?" → A change (or addition) to the Constitution.

Pattern 6: Year written "When was the Constitution written?" → 1787.

Frequently Asked Questions

What is the U.S. Constitution?: The U.S. Constitution is the foundational legal document of the United States — the supreme law of the land. It was drafted in 1787 at the Constitutional Convention in Philadelphia and ratified by the states in 1788, taking effect on March 4, 1789. The Constitution establishes the federal government's structure (with three branches — legislative, executive, and judicial), defines and limits government powers, protects basic individual rights (especially through the Bill of Rights and later amendments), and provides a process for amendment. The original Constitution has seven Articles, and 27 amendments have been added since ratification, with the first 10 (the Bill of Rights) ratified in 1791. On the citizenship test, candidates are expected to know what the Constitution does, that it is the supreme law of the land, and several specific facts about its content and creation.
What are the first three words of the Constitution?: The first three words of the U.S. Constitution are "We the People." These words begin the Preamble, which states: "We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America." The phrase "We the People" represents the principle of self-government — the people are the source of governmental authority, not a king or any other ruling power. On the citizenship test, the question "The idea of self-government is in the first three words of the Constitution. What are these words?" is answered with "We the People."
What is the supreme law of the land?: The U.S. Constitution is the supreme law of the land. This means all federal, state, and local laws must comply with the Constitution; if a law conflicts with the Constitution, the Constitution wins; the Supreme Court has the final authority on what the Constitution means; and no government official is above the Constitution. The phrase "supreme law of the land" comes directly from Article VI of the Constitution, which states that the Constitution, federal laws made under it, and treaties are the supreme law of the land. State court judges are bound by this provision, even if state constitutions or laws say otherwise. On the citizenship test, the question "What is the supreme law of the land?" is answered simply with "the Constitution."
What is an amendment to the Constitution?: An amendment is a formal change or addition to the U.S. Constitution. The Constitution can be amended through Article V's procedures: an amendment must be proposed by either a two-thirds vote in both chambers of Congress (the only method used so far) or by a constitutional convention called by two-thirds of state legislatures (never used), and then ratified by either three-fourths of state legislatures or conventions in three-fourths of states. As of today, 27 amendments have been ratified — the first 10 in 1791 (the Bill of Rights) and the most recent in 1992 (the 27th Amendment, regarding congressional pay). The amendment process is intentionally difficult so the Constitution is not changed lightly. On the citizenship test, "What is an amendment?" is answered with "a change (to the Constitution)" or "an addition (to the Constitution)."
How many Articles does the original Constitution have?: The original U.S. Constitution has seven Articles. Article I establishes the legislative branch (Congress). Article II establishes the executive branch (the President). Article III establishes the judicial branch (the Supreme Court and other federal courts). Article IV addresses relations among the states (full faith and credit, extradition, admission of new states). Article V describes the process for amending the Constitution. Article VI declares the Constitution to be the supreme law of the land and requires officials to swear an oath to support it. Article VII specified that the Constitution would take effect when ratified by nine of the original thirteen states. The first three Articles establish the three branches of government and remain the most-cited parts of the Constitution. While the citizenship test typically doesn't ask "How many Articles are in the Constitution?" directly, the structure underlies many test questions about how the federal government works.
When was the U.S. Constitution written?: The U.S. Constitution was written in 1787 at the Constitutional Convention in Philadelphia, Pennsylvania. The Convention met from May to September 1787, with 55 delegates from 12 of the 13 states (Rhode Island did not send delegates). George Washington presided over the Convention. The Constitution was then sent to the states for ratification, and was ratified by the ninth state (New Hampshire) on June 21, 1788, allowing it to take effect. The new federal government under the Constitution began operating on March 4, 1789, with George Washington's inauguration as the first President. The Bill of Rights — the first 10 amendments — was ratified by enough states to take effect on December 15, 1791. On the citizenship test, the question "When was the Constitution written?" is answered with "1787."

Bottom Line

The U.S. Constitution is the foundational document of the United States — written in 1787, ratified in 1788, and in effect since 1789. It is the supreme law of the land. The Constitution begins with the Preamble ("We the People...") and contains seven Articles establishing the federal government's structure, plus 27 amendments added since ratification. The first 10 amendments are the Bill of Rights (1791). For the citizenship test, memorize: the Constitution is the supreme law of the land; the first three words are "We the People"; the Constitution sets up the government, defines the government, and protects basic rights; an amendment is a change (or addition) to the Constitution; the Constitution has 27 amendments; the first 10 are the Bill of Rights; and the Constitution was written in 1787. The Constitution isn't just historic — it remains the active framework for American government and the source of legal protection for every citizen. For more citizenship test topics, see our guides on the branches of government explained, the Bill of Rights — 10 amendments, the N-400 application process walkthrough, and the complete citizenship exam pass rate guide.

Source: USCIS — Study for the Test · National Archives — Constitution of the United States · National Constitution Center