Chapter 3: How the U.S. Government Works: The Three Branches
One of the most important things to understand about the United States is how its government is structured — and why it was designed that way. The Founders didn’t just want a government that worked; they wanted one that couldn’t be abused. Their solution was to divide power across three separate branches, each with its own role and each acting as a check on the others. Understanding how those three branches work, both individually and together, is essential for the civics test.
What This Chapter Covers
This chapter brings together the Legislative Branch, the Executive Branch, and the Judicial Branch into one unified picture. You will learn how Congress is structured, how laws are actually made, and why the House of Representatives and the Senate differ from one another. You will explore the role of the President, the Cabinet, the Vice President, and the military chain of command. And you will study the federal court system, the Supreme Court, and why federal judges are appointed rather than elected.
The three branches are not meant to be understood in isolation — they are a system, deliberately designed to balance power. This chapter helps you see that system as a whole.
Questions about the three branches of government are among the most frequently tested topics on both the 2008 and 2025 civics exams. Pay close attention to the specific numbers in this chapter — 435 representatives, 100 senators, 9 Supreme Court justices — as these details come up directly on the test.
Why the Three Branches Were Created This Way
During the Constitutional Convention, the Founders were deeply concerned about concentrated power. They had experienced rule under a distant monarch and had no intention of recreating it. Their answer was the principle of separation of powers: giving each branch distinct authority so that no single person or group could dominate the government. Congress makes federal laws, the President enforces them, and the courts review them. Each branch depends on and is limited by the others.
Preparing for the Civics Test
As you work through this chapter, keep an eye on the specific eligibility requirements for each role — minimum ages, citizenship requirements, term lengths, and how each position is filled. These are exactly the kinds of facts the civics test asks about. The chapter also reinforces the principle of separation of powers introduced in Chapter 2, showing how that principle plays out in practice across all three branches.
What You'll Learn in This Chapter
- The Legislative Branch — how Congress is structured, the difference between the House and the Senate, and how federal laws are made.
- The House of Representatives — 435 voting members, congressional districts, 2-year terms, and the role of the Speaker of the House.
- The Senate — 100 senators, 2 per state, 6-year terms, and the Senate’s unique role in confirming federal judges.
- The Executive Branch — the President, Vice President, Cabinet, and executive departments and agencies.
- The Commander in Chief — the President’s role leading the six branches of the U.S. Armed Forces.
- Presidential elections — 4-year terms, the two-term limit, and the two major political parties.
- Line of succession — what happens if the President can no longer serve.
- The Judicial Branch — the Supreme Court, lower federal courts, and why judges are nominated rather than elected.
- Supreme Court justices — nine justices, the Chief Justice, and how decisions are made.