---
title: "Article III of the Constitution — AP Gov Definition"
description: "Article III creates the federal judiciary, the Supreme Court, and lifetime tenure for judges. Key to AP Gov Topic 2.8, judicial review, and Federalist 78."
canonical: "https://fiveable.me/ap-gov/key-terms/article-iii-of-the-constitution"
type: "key-term"
subject: "AP US Government"
unit: "Unit 2"
---

# Article III of the Constitution — AP Gov Definition

## Definition

Article III of the Constitution establishes the judicial branch, creating the Supreme Court, letting Congress create lower federal courts, and protecting judicial independence through lifetime tenure during 'good behavior' and salaries that can't be cut.

## What It Is

[Article III](/ap-gov/unit-2/judicial-branch/study-guide/y7kYkIyrT8DYX1Ud7Y75 "fv-autolink") is the part of [the Constitution](/ap-gov/key-terms/the-constitution "fv-autolink") that builds the judicial branch. It's surprisingly short. It creates exactly one court by name (the Supreme Court), gives Congress the power to create all lower federal courts, defines the kinds of cases federal courts can hear, and protects judges with two big shields. Judges serve for life 'during good behavior,' and Congress can't lower their pay while they're in office.

Those two protections are the whole point for [AP Gov](/ap-gov "fv-autolink"). Lifetime tenure and salary protection mean federal judges don't have to please voters, presidents, or Congress to keep their jobs. That independence is what lets the judiciary check the other two branches. One thing Article III does NOT do is mention judicial review. The power to strike down laws as unconstitutional was argued for in **Federalist No. 78** and made real in *Marbury v. Madison* (1803). Article III is the foundation; judicial review got built on top of it.

## Why It Matters

Article III lives in Topic 2.8 (The Judicial Branch) in [Unit 2](/ap-gov/unit-2 "fv-autolink"): Interactions Among Branches of Government. The CED names it directly under learning objective 2.8.A, which asks you to explain [judicial review](/ap-gov/key-terms/judicial-review "fv-autolink") and how it checks the other branches. The essential knowledge pairs Article III with Federalist No. 78 as the two documents that set up the judiciary's powers and the argument for its independence. Article III also feeds the bigger Unit 2 story. The exam loves asking how the three branches check each other, and the judiciary's check (judicial review) only works because Article III made judges independent enough to use it.

## Connections

### [Federalist No. 78 (Unit 2)](/ap-gov/key-terms/federalist-no-78)

The CED pairs these two documents on purpose. Article III gives judges lifetime tenure; Federalist 78 explains why that matters, arguing an [independent judiciary](/ap-gov/key-terms/independent-judiciary "fv-autolink") is the 'least dangerous' branch and should be able to strike down unconstitutional laws. Article III is the structure, Federalist 78 is the argument.

### [Checks and Balances (Units 1-2)](/ap-gov/key-terms/checks-and-balances)

Article III is the judiciary's entry in the checks-and-balances system from [Unit 1](/ap-gov/unit-1 "fv-autolink"). Because judges can't be fired by a president or voted out, they can rule against the other branches without fearing for their jobs. Independence is what makes the judicial check credible.

### [Appellate Jurisdiction (Unit 2)](/ap-gov/key-terms/appellate-jurisdiction)

Article III splits the Supreme Court's power into [original jurisdiction](/ap-gov/key-terms/original-jurisdiction "fv-autolink") (a tiny set of cases it hears first) and appellate jurisdiction (everything else, reviewing lower court decisions). Almost all the Court's work today comes through appellate jurisdiction via certiorari.

### [Circuit Courts (Unit 2)](/ap-gov/key-terms/circuit-courts)

Article III only names the Supreme Court. Every other federal court, including the district courts and circuit courts of appeals, exists because Congress used its Article III power to create 'inferior courts.' That's a structural check Congress holds over the judiciary.

## On the AP Exam

This shows up most often in multiple choice. Common stems ask which document establishes the foundation for judicial power (answer: Article III), what Article III establishes about the Supreme Court, or which specific provision creates judicial independence (lifetime tenure and salary protection are the answers to look for). No released FRQ has asked about Article III by name, but it backs up SCOTUS comparison and concept application questions about the judiciary. The classic trap is judicial review. If a question asks where judicial review comes from, the answer is Marbury v. Madison and the reasoning in Federalist 78, not the text of Article III itself.

## Article III of the Constitution vs Federalist No. 78

Both are required documents tied to the judicial branch in Topic 2.8, and the CED lists them side by side, so MCQs love swapping them. Article III is the constitutional text that creates the courts and protects judges. Federalist No. 78 is Hamilton's essay arguing why that independence is safe and why courts should have judicial review. If the question says 'establishes the foundation for judicial power,' pick Article III. If it says 'argues for judicial independence' or 'least dangerous branch,' pick Federalist 78.

## Key Takeaways

- Article III creates the judicial branch, names only the Supreme Court, and lets Congress establish all lower federal courts.
- Federal judges serve for life during 'good behavior' and their salaries cannot be reduced, which protects them from political pressure.
- Judicial review is not written in Article III; it was argued for in Federalist No. 78 and established by Marbury v. Madison in 1803.
- Article III gives the Supreme Court original jurisdiction in a few specific cases and appellate jurisdiction over everything else.
- The CED pairs Article III with Federalist No. 78 as the two documents behind judicial power and judicial independence, so know which one does what.

## FAQs

### What is Article III of the Constitution in AP Gov?

Article III is the constitutional foundation of the judicial branch. It creates the Supreme Court, lets Congress create lower federal courts, defines federal jurisdiction, and guarantees judges lifetime tenure and salary protection. It's a required document in Topic 2.8.

### Does Article III establish judicial review?

No. Article III never mentions judicial review. Hamilton argued for it in Federalist No. 78, and the Supreme Court claimed the power in Marbury v. Madison (1803). This is one of the most common trap answers on AP Gov multiple choice.

### How is Article III different from Federalist No. 78?

Article III is the actual constitutional text that builds the courts and protects judges. Federalist No. 78 is Hamilton's persuasive essay defending judicial independence and arguing courts should strike down unconstitutional laws. Foundation versus argument.

### Why do federal judges serve for life?

Article III says judges hold office 'during good behavior,' which means lifetime tenure unless they're impeached. Combined with salary protection, this insulates judges from political pressure so they can check Congress and the president without fearing for their jobs.

### Does Article III create all the federal courts?

No, it only creates the Supreme Court by name. Article III gives Congress the power to establish 'inferior courts,' which is how district courts and circuit courts of appeals exist. That power is one of Congress's checks on the judiciary.

## Related Study Guides

- [2.8 The Judicial Branch](/ap-gov/unit-2/judicial-branch/study-guide/y7kYkIyrT8DYX1Ud7Y75)

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