The U.S. Constitution Explained in Plain English

Updated: October 30, 2026

The U.S. Constitution is the supreme law of the land. Written in 1787, it sets up the federal government, defines and limits its powers, divides it into three branches, and protects the rights of the people. It has been changed only 27 times through amendments, and it is the single most important topic on the citizenship civics test.

Why the Constitution was written

After independence, the 13 states were first governed under the Articles of Confederation. That system gave the national government very little power: it could not collect taxes directly, regulate trade between states, or enforce its laws well. By the mid-1780s many leaders believed a stronger national government was needed.

In the summer of 1787, delegates met in Philadelphia at what became the Constitutional Convention. George Washington served as president of the convention, and James Madison played such a central role in the design that he is called the "Father of the Constitution." The delegates signed the finished document on September 17, 1787, which is why that date is now Constitution Day. After the states ratified it, the new government began operating in 1789.

To win public support, Madison, Alexander Hamilton, and John Jay wrote the Federalist Papers under the shared pen name "Publius," explaining and defending the new Constitution. All four answers (Madison, Hamilton, Jay, Publius) are accepted on the 2025 test for the question about the Federalist writers.

The Preamble - "We the People"

The Constitution opens with a one-sentence introduction:

"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 first three words carry a big idea. Power comes from the people, not from a king. The 2025 civics test asks what "We the People" means, and accepted answers include self-government, popular sovereignty, consent of the governed, and people should govern themselves.

The seven articles

The main body of the Constitution has seven articles:

Article I - Congress. Creates the legislative branch, with a Senate and a House of Representatives, and lists its powers, such as making laws, collecting taxes, and declaring war. See how Congress works.
Article II - The President. Creates the executive branch, sets the four-year term, and makes the president Commander in Chief.
Article III - The courts. Creates the Supreme Court and allows Congress to set up lower federal courts. See the Supreme Court explained.
Article IV - The states. Covers how states relate to each other and how new states join.
Article V - Amendments. Explains how the Constitution can be changed.
Article VI - Supremacy. Makes the Constitution and federal laws the supreme law of the land.
Article VII - Ratification. Explains how the Constitution would take effect.

Key principles built into the Constitution

Separation of powers: power is split among three branches. See the three branches of government.
Checks and balances: each branch can limit the others, so one part does not become too powerful.
Federalism: power is shared between the national government and the states. See federal vs. state powers.
Rule of law: everyone, including leaders and the government, must obey the law. No one is above the law.
Limited government: the government only has the powers the people give it.

How the Constitution is changed

Changes are made through amendments. Under Article V, the usual path is:

Two-thirds of both the House and the Senate approve a proposed amendment.
Three-fourths of the states (38 of 50) ratify it.

This is intentionally hard. Thousands of amendments have been proposed, but only 27 have been ratified. The first ten, ratified in 1791, are the Bill of Rights. The most recent, the 27th Amendment, was ratified in 1992.

Amendments worth knowing for the test:

10th: powers not given to the federal government belong to the states or the people.
14th: people born or naturalized in the U.S., and subject to its jurisdiction, are citizens.
15th, 19th, 24th, 26th: the four voting amendments (any race for male citizens, women, no poll tax, age 18).
16th: allows the federal income tax.
22nd: limits the president to two terms.

Constitution questions on the 2025 civics test

From the official USCIS list of 128 questions:

What is the supreme law of the land? The (U.S.) Constitution
Name one thing the U.S. Constitution does. Forms the government, defines powers of government, defines the parts of government, or protects the rights of the people
How are changes made to the U.S. Constitution? Amendments / the amendment process
How many amendments does the U.S. Constitution have? Twenty-seven (27)
What founding document was written in 1787? The (U.S.) Constitution
Many documents influenced the U.S. Constitution. Name one. Declaration of Independence, Articles of Confederation, Federalist Papers, Anti-Federalist Papers, Virginia Declaration of Rights, Fundamental Orders of Connecticut, Mayflower Compact, or Iroquois Great Law of Peace
Name two important ideas from the Declaration of Independence and the U.S. Constitution. Equality, liberty, social contract, natural rights, limited government, self-government
What is the rule of law? Everyone must follow the law; leaders must obey the law; government must obey the law; no one is above the law

You can review all of them on the civics questions page. Questions 2 and 7 are marked with an asterisk, meaning they are also on the shorter list for 65/20 applicants.

Constitution vs. Declaration of Independence

These two get mixed up constantly. The Declaration of Independence (1776) announced that the colonies were free from Britain and contains "Life, Liberty, and the pursuit of Happiness." The Constitution (1787) created the government that runs the country today. If a question mentions 1787, amendments, or the supreme law, the answer is the Constitution. See the American Revolution on the civics test for the Declaration.

Frequently asked questions

What is the supreme law of the land?

The U.S. Constitution. Article VI makes the Constitution, and the federal laws and treaties made under it, the supreme law of the land.

How many amendments does the Constitution have?

Twenty-seven. The first ten are the Bill of Rights, ratified in 1791, and the most recent is the 27th Amendment, ratified in 1992.

When was the Constitution written?

It was written in 1787 at the Constitutional Convention in Philadelphia and signed on September 17, 1787. The new government began in 1789.

Who is called the Father of the Constitution?

James Madison. He is also one of the writers of the Federalist Papers and was the fourth president of the United States.

What does "We the People" mean on the civics test?

USCIS accepts self-government, popular sovereignty, consent of the governed, people should govern themselves, or an example of a social contract.

Prepare for the civics test with Civio: every official question from the 2025 USCIS civics test, Exam Mode with your state's questions, and spaced repetition.

Informational article, not legal advice. Civio is not affiliated with USCIS or any government agency; always check current requirements at uscis.gov.