AP® United States Government and Politics review sheet from Aim for Five (aimforfive.com/gov/units/2/2-1)
Unit 2 · Topic 2.1
2.1 Congress: The Senate and the House of Representatives
Congress is bicameral: the House represents people by population, and the Senate gives every state two seats. The two chambers were designed differently on purpose, with different sizes, terms and special powers. Together they hold the enumerated powers in Article I, plus implied powers through the Necessary and Proper Clause.
Key terms
- bicameral legislature
- enumerated powers
- implied powers
- Necessary and Proper Clause
- congressional oversight
- republicanism
Why two chambers?
A bicameral legislature has two houses. The Great Compromise (1.5) produced this design: the House of Representatives, based on population, and the Senate, with equal representation for each state. The founders also wanted the chambers to check each other. The House, elected often and in smaller districts, was meant to respond quickly to public opinion. The Senate, with longer, staggered terms, was meant to be slower and steadier.
This reflects republicanism, the founders' idea that the people govern through elected representatives who are supposed to serve the common good, rather than ruling directly.
House versus Senate
| Feature | House of Representatives | Senate |
|---|---|---|
| Size | 435 voting members, divided among states by population after each census | 100 members, two per state |
| Term | 2 years; every seat up each election | 6 years; about one-third up every 2 years |
| Minimum age and citizenship | 25 years old; citizen for 7 years | 30 years old; citizen for 9 years |
| Who they represent | A district (or a whole state, for the smallest states) | An entire state |
| Originally chosen by | Voters | State legislatures, until the 17th Amendment (1913) required direct election |
| Special powers | Revenue (tax) bills must start here; impeaches officials; chooses the president if no candidate wins an Electoral College majority | Confirms appointments (majority vote); ratifies treaties (two-thirds); holds impeachment trials; chooses the vice president if no Electoral College majority |
| Rules and debate | Strict rules; debate time is limited | Few limits on debate; individual senators have more power |
Enumerated powers
Article I, Section 8 lists Congress's enumerated powers. The big ones you should know:
- Lay and collect taxes, and pay debts
- Borrow money on the credit of the United States
- Regulate commerce with foreign nations, among the states and with tribes
- Coin money
- Declare war, and raise and support an army and navy
- Establish lower federal courts
- Make laws on naturalization (how immigrants become citizens)
Implied powers and the Necessary and Proper Clause
The last clause of Article I, Section 8 lets Congress make all laws “necessary and proper” for carrying out its listed powers. These unlisted but reasonable powers are implied powers. Creating a national bank (McCulloch v. Maryland, 1.8), setting a minimum wage under the commerce power, and creating federal agencies are all built on implied powers. Because this clause stretches Congress's reach, it's often called the elastic clause.
Oversight
Congressional oversight is Congress's review of how the executive branch carries out laws. Committees hold hearings, call agency heads to testify, investigate problems and decide how much money agencies get. Oversight isn't listed word for word in the Constitution, but it comes from Congress's lawmaking and spending powers. You'll see much more of it in 2.14.
Worked examples
Try each one yourself first, then open the solution.
- Example 1
Explaining a structural difference
Public opinion shifts sharply on an issue over a few months. Explain why the House is more likely than the Senate to reflect that shift quickly.
Show the solutionHide the solution
- Step 1: Identify the relevant structural difference: House members serve 2-year terms and all face reelection at once; senators serve 6-year staggered terms.
- Step 2: Connect to behavior: House members are always close to their next election, so they have a strong incentive to follow current opinion in their districts.
- Step 3: Contrast: only about a third of senators face voters in any given election, so many can wait out a short-term shift.
Answer: Because all House members face reelection every two years, they feel pressure to respond quickly to changing opinion, while senators' six-year staggered terms insulate most of them from short-term swings.
Common mistakes
- Saying the Senate starts tax bills. Revenue bills must originate in the House.
- Saying the House ratifies treaties or confirms judges. Those are Senate-only powers.
- Thinking the number of House seats grows with population. The total is fixed at 435 by law; the census only reallocates seats among states.
On the exam
- Multiple-choice questions frequently test which chamber holds a power or why the chambers differ. Memorize the table.
- When explaining a difference, link the structure (term length, size, constituency) to a behavior (responsiveness, deliberation).
Connected topics
Videos
Check yourself
4 questions on 2.1 Congress: The Senate and the House of Representatives. Pick an answer to see if you got it, and why.
Which feature of Congress best reflects the framers' goal of making the Senate a more stable, continuous body than the House?
Between two censuses, State K's population grows much faster than the populations of most other states. What is the most likely effect on State K's representation in Congress?
Which of the following bills must, under the Constitution, be introduced first in the House of Representatives?
The president signs a treaty with three other countries to protect fishing grounds. Before the United States is bound by it as a treaty, what must happen?
0 of 4 answered