Congress: lawmaking, representation and procedure
Compare the House and Senate, trace legislation through Congress, and analyse how procedure and representation shape outcomes.
Section 2.1 · Legislative Branch
Exam scope and assessment notes
This is a standalone AS Level qualification for centres in the United States of America. The syllabus is for June examinations in 2028–2030, uses digital exams and is not available in every administrative zone. Confirm local availability and entry with Cambridge and the exam centre. This original StudyForA course maps teaching and staged practice to all 15 syllabus sections, including separate race, gender and disability-rights lessons under section 4.4. Full digital examination practice, complete analysis of all mandatory documents and landmark cases against official resources, and subject-specialist review remain outstanding. It is not Cambridge-authored material and does not provide official marks.
Before you begin
- Know that the United States has national and state governments
- Distinguish a constitutional rule from a political claim about its effects
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which pair gives the strongest basis for evaluating a political claim?
What you will learn
- Compare the structure and exclusive powers of the House and Senate and explain Congress's joint responsibilities
- Explain the legislative process, committee work, procedural checks and interest-group influence
- Compare representation models and analyse party leadership, divided government, gridlock, polarisation, bipartisanship and factionalism
The two chambers combine different forms of representation
The House of Representatives is apportioned by population; members serve two-year terms. Its exclusive powers include initiating articles of impeachment, originating revenue bills and resolving a tie in the Electoral College. The Senate has two members per state serving six-year terms; its exclusive powers include advice and consent, treaty ratification and trying impeachments.
Congress also acts jointly: it legislates, declares war, regulates interstate commerce and fiscal and trade policy, passes a budget, oversees the executive, proposes amendments and may override a presidential veto. McCulloch v. Maryland (1819) supports Congress's implied powers and the Supremacy Clause in the national-bank dispute.
A bill moves through institutions and procedures
A bill must be introduced, considered and passed in both chambers in the same form before it can go to the President. Committees can investigate, amend, advance or block bills. Standing committees are ongoing; joint committees contain members of both chambers; special or select committees investigate a defined matter; conference committees reconcile different chamber versions.
Senate procedures can delay or shape action. A filibuster prolongs debate or blocks a vote; cloture is the procedure for ending debate under Senate rules. A hold signals an intent to delay action. A discharge petition can move a bill out of a House committee when the required support is reached. Reconciliation is a budget-related procedure; resolutions express a chamber's position or govern internal business. Know the tool's function rather than treating every procedure as a veto.
Representation and party organisation affect decisions
A delegate follows constituents' expressed preferences; a trustee uses independent judgement; a partisan model gives weight to party commitments. Constituent services help residents deal with government. These are models for analysing behaviour, not fixed descriptions of every legislator.
Party leaders influence agendas and votes. Divided government occurs when control of institutions is split across parties and may contribute to gridlock, but outcomes also depend on rules, issue coalitions and bargaining. Polarisation, partisan voting, bipartisan cooperation, party discipline and factionalism can coexist in different patterns. Interest groups may lobby, provide policy information, encourage logrolling or advocate pork-barrel legislation; distinguish evidence of influence from a claim of control.
Sources for this lesson
Pause and explain
What condition must be met before a bill passed in different forms can be sent to the President?
Worked example
A House committee rewrites a bill, the full House passes it, and the Senate adopts a different version. What must happen before the bill can go to the President?
Show the worked solution
- Identify the difference between the chamber versions.
- Explain how the chambers can reconcile the texts.
- State what must be true before presentment.
Answer The House and Senate must pass the same version. A conference committee may negotiate a compromise text, which both chambers then approve before it can be sent to the President. Passing different versions is not enough.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Guided: Classify these actions: the House initiates impeachment articles; the Senate gives advice and consent on a nomination; both chambers pass a budget. Explain the distinction.
Give me a hint
Look for powers the syllabus assigns exclusively to one chamber and joint responsibilities.
Compare my reasoning
- The House initiates articles of impeachment as an exclusive power.
- The Senate exercises advice and consent as an exclusive power.
- Passing a budget is a joint responsibility of Congress.
The House action is an exclusive House power; advice and consent is an exclusive Senate power; passing a budget is a joint responsibility. The Constitution gives the chambers distinct roles as well as work they perform together.
Look for these in your work
- Assigns the House power correctly
- Assigns the Senate power correctly
- Distinguishes a joint responsibility
Independent: A bill passes the House and Senate in different forms. Outline the route to a final text and identify one committee role.
Give me a hint
Explain both reconciliation and final approval.
Compare my reasoning
- The chambers need one identical text.
- A conference committee may negotiate between the versions.
- Both chambers must approve the agreed version before it is sent to the President.
A conference committee can reconcile differences and recommend one text. Both the House and Senate must approve that same version before it goes to the President. The committee helps negotiate; it does not replace votes in the chambers.
Look for these in your work
- Explains why the texts must match
- Identifies the conference committee's role
- Includes approval by both chambers
Transfer: A representative votes against a party position after constituents in the district oppose the bill. Which representation model best fits, and what additional evidence would distinguish it from a one-off vote?
Give me a hint
Use a model to explain the stated reason, then avoid inferring a permanent pattern from one case.
Compare my reasoning
- Connect constituent preferences to the delegate model.
- Recognise that one vote may have several causes.
- Look for repeated votes, statements and constituency evidence before making a broader claim.
The stated reason fits the delegate model because the representative follows constituents' expressed preferences. One vote does not establish a general style: examine a pattern of votes, the member's explanations, constituent views and other pressures before reaching that conclusion.
Look for these in your work
- Selects the delegate model
- Uses the stated reason
- Requests evidence before generalising
Common mistakes
- Giving the House and Senate the same membership structure or exclusive powers
- Assuming committee approval guarantees a bill becomes law
- Treating divided government as proof that Congress cannot act
What can you explain now?
What condition must be met before a bill passed in different forms can be sent to the President?
Compare with the explanation
Both chambers must approve the same text
A conference committee can help reconcile versions, but each chamber must still approve the final text.
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Make it stick
What condition must be met before a bill passed in different forms can be sent to the President?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.