Articles 1, 2, and 3 of the Constitution create the three branches of the federal government and set the boundaries of what each can do. Article I establishes Congress and gives it the power to make laws. Article II establishes the presidency and gives it the power to enforce them. Article III establishes the Supreme Court and the federal court system and gives them the power to interpret them. Read together, these three articles are the structural core of American government.
Article I: Congress
Article I places all federal lawmaking power in a Congress made up of two chambers. The House of Representatives distributes seats by population, so larger states have more members. The Senate gives every state two seats regardless of size.
House members serve two-year terms, which keeps them close to public opinion.1house.gov. The House Explained A representative must be at least 25 years old, a U.S. citizen for at least seven years, and a resident of the state they represent at the time of election.2U.S. Capitol – Visitor Center. The U.S. House of Representatives
Senators serve six-year terms, with roughly one-third of the chamber up for election every two years. Each state gets two.3Constitution Annotated. Article I Section 3 Clause 1 The qualifications are stiffer: at least 30 years old, a citizen for at least nine years, and living in the state.4Legal Information Institute. Overview of Senate Qualifications Clause The Vice President serves as President of the Senate but votes only to break a tie.5U.S. Senate. Votes to Break Ties in the Senate
What Congress Can Do
Section 8 of Article I lists Congress’s specific powers. The broadest is the taxing and spending power. Congress can collect taxes, duties, and excises to pay debts and provide for the common defense and general welfare, though those taxes must be uniform across the country.6Constitution Annotated. Article I Section 8 Clause 1 Congress can also borrow on the nation’s credit.7Constitution Annotated. Article I Section 8 – Enumerated Powers
The other enumerated powers cover a wide range of national functions: regulating commerce with foreign nations and between the states, setting rules for immigration and bankruptcy, coining money, fixing standards for weights and measures, creating post offices, and protecting inventions through patents.7Constitution Annotated. Article I Section 8 – Enumerated Powers Congress alone has the authority to declare war and to raise and fund the military, and military funding cannot be appropriated for longer than two years at a time.
At the end of Section 8 sits the Necessary and Proper Clause, which lets Congress pass any law needed to carry out its listed responsibilities.7Constitution Annotated. Article I Section 8 – Enumerated Powers This is why Congress can act on subjects the text never names, as long as the action is tied to executing an enumerated power.
How a Bill Becomes Law
Section 7 controls the mechanics. Tax bills must start in the House, though the Senate can amend them freely.8Constitution Annotated. Origination Clause and Revenue Bills Once both chambers pass a bill, it goes to the President. A signature makes it law. A veto sends it back to the chamber where it started, and Congress can override only with a two-thirds vote in each chamber.9Constitution Annotated. Veto Power
There is also the pocket veto. If Congress adjourns before the ten-day signing period expires and the President has not signed, the bill dies. A pocket veto cannot be overridden; the legislative process starts over.9Constitution Annotated. Veto Power
What Congress and the States Cannot Do
Section 9 puts hard limits on Congress. The right of habeas corpus, the ability to challenge being held without charges, cannot be suspended except during rebellion or invasion when public safety demands it. Congress cannot pass bills of attainder, which declare someone guilty without a trial, or ex post facto laws, which retroactively criminalize conduct that was legal when it occurred.10Congress.gov. Constitution Annotated – Section 9 Powers Denied Congress
On the money side, no funds can leave the Treasury unless Congress has specifically appropriated them by law, and the government must publish regular accounts of revenue and spending.11Constitution Annotated. Overview of Appropriations Clause No matter what a President wants to spend money on, the funds cannot flow without a congressional appropriation. Section 9 also bans titles of nobility.
Section 10 restricts the states. No state can enter into a treaty or alliance with a foreign power, coin its own money, issue its own paper currency, or make anything other than gold and silver legal tender for debts.12Constitution Annotated. Article I Section 10 – Powers Denied States States also cannot pass bills of attainder or ex post facto laws. These restrictions keep certain powers exclusively federal.
Article II: The Presidency
Article II vests all executive power in one person: the President of the United States, who serves a four-year term.13Congress.gov. Constitution Annotated – Article II Section 1 The qualifications are the strictest in the Constitution. A President must be a natural-born citizen, at least 35 years old, and a resident of the United States for at least 14 years.14Legal Information Institute. Qualifications for the Presidency
What the President Can Do
The President’s powers fall into a handful of categories. As Commander in Chief, the President provides civilian control over the armed forces and directs military operations, but the power to declare war belongs to Congress. The President can grant pardons and reprieves for federal offenses, with one exception: impeachment cases cannot be pardoned.15Constitution Annotated. Article II Section 2
On foreign affairs, the President can negotiate treaties with other nations, but no treaty takes effect without approval from two-thirds of the senators present.16Constitution Annotated. Overview of Presidents Treaty-Making Power The President appoints ambassadors, federal judges (including Supreme Court justices), and other senior officials, and all of those appointments require Senate confirmation.
Section 3 sets out the President’s ongoing duties. The President must periodically report to Congress on the state of the nation, which is the basis for today’s State of the Union address, and recommend legislation.17Constitution Annotated. Article II Section 3 The President receives foreign ambassadors, which in practice means recognizing foreign governments, and must “take care that the laws be faithfully executed.”18Library of Congress. U.S. Constitution – Article II The Take Care Clause is the constitutional basis for federal enforcement, from the Justice Department to the regulatory agencies.
Article III: The Federal Courts
Article III creates the Supreme Court and lets Congress establish lower federal courts as needed. Federal judges hold their positions “during good behavior,” which functions as a lifetime appointment. They can be removed only through impeachment.19Constitution Annotated. Good Behavior Clause Doctrine Their pay cannot be reduced while they serve.20Constitution Annotated. Article III Section 1 Compensation Together these protections make the judiciary the most insulated branch, so a judge does not have to worry about reelection or a salary cut for ruling against the government.
What Federal Courts Can Hear
Section 2 defines the reach of federal judicial power. It extends to all cases arising under the Constitution, federal law, and treaties. It also covers cases involving ambassadors and other diplomats, admiralty and maritime cases, cases where the federal government is a party, disputes between states, and controversies between citizens of different states.21Legal Information Institute. Article III U.S. Constitution
The Supreme Court has two kinds of jurisdiction. Original jurisdiction, where the Court hears a case first, is limited to cases involving ambassadors and cases where a state is a party. Everything else reaches the Court through appeal.22Congress.gov. Supreme Court Original Jurisdiction Congress can regulate the Court’s appellate jurisdiction but cannot expand or shrink its original jurisdiction.
Treason
Section 3 defines treason, the only crime the Constitution itself spells out. Treason against the United States consists solely of waging war against the country or giving aid and comfort to its enemies.23Congress.gov. Constitution of the United States – Article III Section 3 The definition is deliberately narrow, because in England treason charges had been used to silence political opponents.
Conviction requires either the testimony of two witnesses to the same overt act or a confession in open court.23Congress.gov. Constitution of the United States – Article III Section 3 Congress sets the punishment, with one limit: the penalty cannot include “corruption of blood,” so the government cannot strip rights or property from the family or descendants of a convicted traitor.24Congress.gov. Article III Section 3 Clause 2
Impeachment
Impeachment is the mechanism that ties the three branches together. It is how the Constitution removes a sitting President, Vice President, or other federal officer, including judges, for serious misconduct. The grounds are “treason, bribery, or other high crimes and misdemeanors.”
The process has two stages. The House of Representatives holds the sole power to impeach, meaning it brings the formal charges.25Congress.gov. Overview of Impeachment If the House votes to impeach, the Senate holds the trial. Senators vote under oath, and when the President is on trial, the Chief Justice of the Supreme Court presides. Conviction requires a two-thirds vote of the senators present.26Constitution Annotated. Article I Section 3
Conviction removes the person from office. The Senate can also vote separately to bar them from holding any future federal office. Impeachment itself carries no criminal penalties, but a convicted individual can still face prosecution in ordinary courts afterward.27Legal Information Institute. Overview of Impeachment Trials Removal from office and criminal accountability are separate tracks.
How the Three Articles Check Each Other
The three articles are designed to interlock. Congress writes the laws, but the President can veto them. The President commands the military, but only Congress can declare war and fund it. The President appoints judges, but the Senate must confirm them. The courts can strike down laws passed by Congress or actions taken by the President if they violate the Constitution.
No branch operates alone. The President negotiates treaties, but two-thirds of the Senate must agree. Congress controls the federal budget, and no executive agency can spend a dollar without an appropriation. Federal judges serve for life and can invalidate the actions of the other two branches, but Congress can impeach them for misconduct. Every grant of authority in one article is checked by a limitation in another.