Edexcel A-Level Politics 9PL0 · Paper 3 USA · Content area 2 of 6

2. Congress

structure (House and Senate) · functions · powers · effectiveness and the Parliament comparison.
← All areasPurple = thinker / institution · Orange = example
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2.1 The structure of Congress

Essential A bicameral legislature: the House and the Senate.

The specification
2.1The structure of Congress
Key terminology - tick the terms you can define:
Bicameral nature, the membership of Congress and the election cycle.

Wording above is the Pearson specification, unchanged. Tick a line only when you could answer a question on it without notes.

Past questions - how it has been examined
  • Directly: 2025 Q1B (legislative powers of Congress and Parliament); 2020 Q1a (how the powers of Congress and Parliament are limited).
  • Partially: the effectiveness and oversight essays.
  • Also asked (2023 on): 2023 Q1A (elections and composition compared).
What examiners reward and penalise
  • Stronger: distinguish the House from the Senate precisely.
  • Weaker: treat Congress as one undifferentiated body.
One way to get high marks
  • Credited: the Senate's confirmation and treaty roles make it the more powerful chamber.
  • Evidence: the filibuster; Senate confirmation of Barrett (2020).

The 30-mark essays (Section C). Marks split 10/10/10 across AO1 (knowledge), AO2 (analysis) and AO3 (evaluation), so an answer that describes without judging gives away a third of the marks. Examiners reward "a clear and consistent line of argument": decide your answer before you write, argue it in every paragraph, weigh the counter-argument as you go, and reach "fully substantiated" judgements. A one-sided essay is capped at Level 2 however much it knows. Structure by theme, never by date and never as a list of examples.

The 12-mark questions (Q1 and Q2). Marked on AO1 and AO2 only, 6 marks each. There is no AO3, so no introduction, no conclusion and no overall judgement. Write three short, dense paragraphs, each making a direct US-UK comparison: "in the US... whereas in the UK...". Describing the two systems side by side without comparing them loses the AO2 marks, and discussing only one country caps the answer at Level 1. On Q2 you must also apply one of the three comparative theories (rational, cultural, structural); leaving theory out caps the answer at Level 3.

Arguments and counter-arguments

Is the Senate the more powerful chamber?

Yes

  • Point. The Senate holds exclusive powers that the House does not share. Explanation. Through these powers it shapes who serves in the executive and the judiciary. Example. Only the Senate confirms presidential appointments and ratifies treaties. Evaluation. Against this, the House holds the purse strings first, which is a serious power of its own.

No

  • Point. The House is where all spending begins. Explanation. Control of money is decisive, because no government plan can happen without funding. Example. Revenue bills must start in the House, not the Senate. Evaluation. Even so, the Senate can still amend or block those bills, so the House does not control money alone.
Best judgement. The Senate's exclusive powers give it the edge, but the House's control of revenue keeps the chambers broadly co-equal.
Using it in essays
  • 12-mark: compare the legislative powers of Congress and Parliament.
  • Topic sentence: "Bicameralism splits power between a population-based House and a state-based Senate, each with distinct strengths."
Wider context
Helpful context

The Senate's equal state representation is itself a federal feature, linking back to Area 1.

Examination priority

Essential The foundation of every Congress answer.

Senate-only tools
TermWhat it is
FilibusterTalking a bill out: extended debate that blocks a vote, so most bills need 60 votes to pass the Senate in practice.
ClotureThe motion that ends a filibuster. It needs 60 votes.
HoldsA single senator can delay a bill or nomination simply by objecting to it being brought forward.
Unanimous consentMost Senate business runs on agreements that need every senator's assent, so one objection can stall the floor.
2.2 The functions of Congress

Essential Legislating, representing and overseeing the executive.

The specification
2.2.1Representation
Key terminology - tick the terms you can define:
Congressional elections and the significance of incumbency.
Factors that affect voting behaviour within Congress: parties and caucuses, constituency, pressure groups and lobbyists.
2.2.2Legislative
Key terminology - tick the terms you can define:
The legislative process, including the strengths and weaknesses of this process.
Strengths - I can argue these
Weaknesses - I can argue these
The differences between the legislative process in each chamber.
The policy significance of Congress - impact and effectiveness of laws passed.
2.2.3Oversight
Key terminology - tick the terms you can define:
Factors that influence the relationship between Congress and the presidency.
The checks on the other branches of government and the extent of its institutional effectiveness.

Wording above is the Pearson specification, unchanged. Tick a line only when you could answer a question on it without notes.

Past questions - how it has been examined
  • Directly: 2023 Q3A (Congress is unrepresentative); Sample Q3b and 2025 Q3B (oversight of the President).
  • Partially: the effectiveness essays.
  • Also asked (2023 on): 2023 Mock Q1A (legislative process problems compared); 2024 Q3B (voters' influence on legislators).
What examiners reward and penalise
  • Stronger: judge each function, especially oversight, with examples.
  • Weaker: list functions without evaluating them.
One way to get high marks
  • Credited: oversight is real but uneven and partisan.
  • Evidence: the January 6 committee; the power of the purse.

The 30-mark essays (Section C). Marks split 10/10/10 across AO1 (knowledge), AO2 (analysis) and AO3 (evaluation), so an answer that describes without judging gives away a third of the marks. Examiners reward "a clear and consistent line of argument": decide your answer before you write, argue it in every paragraph, weigh the counter-argument as you go, and reach "fully substantiated" judgements. A one-sided essay is capped at Level 2 however much it knows. Structure by theme, never by date and never as a list of examples.

The 12-mark questions (Q1 and Q2). Marked on AO1 and AO2 only, 6 marks each. There is no AO3, so no introduction, no conclusion and no overall judgement. Write three short, dense paragraphs, each making a direct US-UK comparison: "in the US... whereas in the UK...". Describing the two systems side by side without comparing them loses the AO2 marks, and discussing only one country caps the answer at Level 1. On Q2 you must also apply one of the three comparative theories (rational, cultural, structural); leaving theory out caps the answer at Level 3.

Arguments and counter-arguments

Is Congress representative?

Yes

  • Point. Members of Congress are elected and accountable to their voters. Explanation. Regular elections keep them close to the people they represent. Example. House members face frequent elections, so they must answer to voters often. Evaluation. However, gerrymandering reduces the real choice voters have in many districts.

No

  • Point. Representation is distorted by how districts are drawn and by money. Explanation. Safe seats blunt accountability, because a member who cannot realistically lose has less reason to listen to voters. Example. Gerrymandering and the advantages of incumbency keep many seats safe. Evaluation. Even so, Congress is still more directly elected than the House of Lords.
Best judgement. Congress is formally representative but districting, incumbency and money weaken how representative it is in practice.
Using it in essays
  • 30-mark: Congress is unrepresentative; oversight of the President is ineffective.
  • Topic sentence: "Congress represents and oversees, but partisanship and safe seats blunt both."
Wider context
Helpful context

Oversight links straight to Area 3: how far Congress can actually check the President.

Examination priority

Essential Representation and oversight are recurring 30-mark themes.

How a bill becomes law
CommitteesStanding committees examine and rewrite bills; most bills die here. Conference committees settle House-Senate differences.
Floor votesBoth chambers must pass identical text. The House Rules Committee controls the timetable; in the Senate the filibuster means 60 votes in practice.
LeadershipThe Speaker of the House, the majority and minority leaders in each chamber, and the whips manage the process.
The PresidentSigns the bill or vetoes it; Congress can override with two-thirds in both houses.

Power is dispersed at every stage, so blocking a bill is far easier than passing one. That is the structural root of gridlock.

Who sits in Congress

Congress is older, wealthier, more male and less racially diverse than the country it represents, although each recent Congress has been the most diverse yet. Use this for the 2023 question on Congress being unrepresentative: descriptive representation (mirroring the country) is improving but still lags, while defenders argue what matters is substantive representation, acting for groups rather than resembling them. The specification calls this pairing descriptive versus functional representation: mirroring the population versus acting for its interests.

What shapes a member's vote

Party and constituency pull hardest, alongside caucuses, lobbyists and the administration. Manchin (a Democrat from coal-state West Virginia) blocking Build Back Better in December 2021 shows constituency beating party; Liz Cheney voting to impeach Trump and losing her 2022 Wyoming primary shows voters enforcing the party line. Constituency pressure also drives pork barrel politics: winning federal spending for your own district or state to please voters back home. Congress banned earmarks, the line items that deliver the pork, in 2011, then revived them in 2021 as community project funding, so the pork barrel is open again. Use both whenever a question asks whether party or constituency matters more.

2.3 The powers of Congress and the Parliament comparison

Essential Enumerated powers, the purse, war powers and confirmation.

The specification
2.1.1The distribution of powers within Congress
Key terminology - tick the terms you can define:
powers given to Congress in the Constitution, the exclusive powers of each House and the concurrent powers of Congress.

Wording above is the Pearson specification, unchanged. Tick a line only when you could answer a question on it without notes.

Past questions - how it has been examined
  • Directly: 2022 Q1a (checks and balances on Congress vs Parliament); 2019 Q2 (legislative powers); 2019 Q3a (foreign policy Congress vs President).
  • Also asked (2023 on): 2025 Q1B (legislative powers of both compared).
What examiners reward and penalise
  • Stronger: stress Congress's independence from the executive.
  • Weaker: assume it works like the fused UK system.
One way to get high marks
  • Credited: separation of powers makes Congress more independent but more prone to deadlock than Parliament.
  • Evidence: veto override; the War Powers Resolution (1973).

The 30-mark essays (Section C). Marks split 10/10/10 across AO1 (knowledge), AO2 (analysis) and AO3 (evaluation), so an answer that describes without judging gives away a third of the marks. Examiners reward "a clear and consistent line of argument": decide your answer before you write, argue it in every paragraph, weigh the counter-argument as you go, and reach "fully substantiated" judgements. A one-sided essay is capped at Level 2 however much it knows. Structure by theme, never by date and never as a list of examples.

The 12-mark questions (Q1 and Q2). Marked on AO1 and AO2 only, 6 marks each. There is no AO3, so no introduction, no conclusion and no overall judgement. Write three short, dense paragraphs, each making a direct US-UK comparison: "in the US... whereas in the UK...". Describing the two systems side by side without comparing them loses the AO2 marks, and discussing only one country caps the answer at Level 1. On Q2 you must also apply one of the three comparative theories (rational, cultural, structural); leaving theory out caps the answer at Level 3.

Arguments and counter-arguments

Is Congress more powerful than the UK Parliament?

Yes

  • Point. Congress is independent of the executive in a way Parliament is not. Explanation. It does not answer to the President, so it can openly defy him. Example. Its confirmation power and its control of the purse let it block what the President wants. Evaluation. The price of that independence is gridlock, which can paralyse Congress.

No

  • Point. Parliament is legally sovereign in a way Congress is not. Explanation. No codified constitution limits what it can do. Example. In principle Parliament can pass any law it chooses. Evaluation. In practice, though, the UK executive usually controls Parliament, so that power mostly serves the government.
Best judgement. Congress is more independent of the executive, while Parliament is legally sovereign but executive-dominated; each is powerful in a different way.
Using it in essays
  • 12-mark: checks and balances on Congress vs Parliament.
  • Topic sentence: "Congress is weaker in legal sovereignty but stronger in independence from the executive than Parliament."
Wider context
Helpful context

This is a core comparative question (Area 6), best explained structurally.

Examination priority

Essential The Congress-Parliament comparison is guaranteed territory.

Parliament can defy the executive too

Parliament is usually executive-dominated, but not always: the Commons rejected strikes on Syria in 2013 and defeated May's Brexit deal three times in 2019, the first time by 230 votes, the largest defeat in history. Use these to qualify the claim that Parliament cannot check the executive.

The two Speakers are not alike

Do not confuse the Speakers. The US Speaker of the House is a partisan leader who runs the floor for the majority party: Pelosi and Johnson set the agenda and whip votes, and the 15-ballot fight to elect McCarthy in 2023 showed the office is a party prize. The Commons Speaker is the opposite: neutral, renouncing party on election to the chair, and refereeing debate rather than leading one side.

No Salisbury Convention in the Senate

In the UK, the Salisbury Convention means the Lords do not block bills promised in the governing party's manifesto. There is nothing like it in the US: the Senate owes a president's programme no deference at all, however large the election win. A useful comparative point in any question on legislative checks.

2.4 Effectiveness, gridlock and reform

Important How well Congress works, and why it often does not.

The specification
2.3Interpretations and debates around Congress
Key terminology - tick the terms you can define:
Changing roles and powers of Congress and their relative importance, and debates about adequacy of its representative role.
Changing significance of parties in Congress.
Significance and effectiveness of the powers outlined in the Constitution.

Wording above is the Pearson specification, unchanged. Tick a line only when you could answer a question on it without notes.

Past questions - how it has been examined
  • Directly: 2025 Q3B (Congress fails to hold the President); Sample Q3b (oversight ineffective).
  • Partially: the representation essays.
  • Also asked (2023 on): 2024 Q3B (are voters the biggest influence).
What examiners reward and penalise
  • Stronger: link gridlock to separation of powers and polarisation.
  • Weaker: call Congress 'weak' without explaining why.
One way to get high marks
  • Credited: gridlock is structural, not accidental.
  • Evidence: the 2018-19 government shutdown; the record 43-day 2025 shutdown; the debt-ceiling standoffs (2011 cost the US its AAA rating; 2023 ended in the Fiscal Responsibility Act days before default).

The 30-mark essays (Section C). Marks split 10/10/10 across AO1 (knowledge), AO2 (analysis) and AO3 (evaluation), so an answer that describes without judging gives away a third of the marks. Examiners reward "a clear and consistent line of argument": decide your answer before you write, argue it in every paragraph, weigh the counter-argument as you go, and reach "fully substantiated" judgements. A one-sided essay is capped at Level 2 however much it knows. Structure by theme, never by date and never as a list of examples.

The 12-mark questions (Q1 and Q2). Marked on AO1 and AO2 only, 6 marks each. There is no AO3, so no introduction, no conclusion and no overall judgement. Write three short, dense paragraphs, each making a direct US-UK comparison: "in the US... whereas in the UK...". Describing the two systems side by side without comparing them loses the AO2 marks, and discussing only one country caps the answer at Level 1. On Q2 you must also apply one of the three comparative theories (rational, cultural, structural); leaving theory out caps the answer at Level 3.

Arguments and counter-arguments

Does Congress effectively check the President?

Yes

  • Point. Congress has real tools for checking the President. Explanation. It can block what the President wants and investigate how the executive behaves. Example. It holds the power of the purse, runs oversight hearings, and can impeach the President. Evaluation. Even so, removing a President through impeachment has been tried twice and failed both times.

No

  • Point. Partisanship blunts the checks that Congress holds. Explanation. Members usually put loyalty to their own party ahead of serious oversight of a president from that party. Example. Impeachment convictions have failed and gridlock has stalled action against the executive. Evaluation. However, divided government can revive these checks, because an opposing majority is willing to use them.
Best judgement. Congress has powerful checks but uses them unevenly: partisanship often blunts oversight, while divided government sharpens it.
Using it in essays
  • 30-mark: Congress fails to hold the President; oversight is ineffective.
  • Topic sentence: "Congress has the tools to check the President but partisanship decides whether it uses them."
Wider context
Helpful context

Whether gridlock is a flaw or the intended price of liberty links back to Area 1.

Examination priority

Important Effectiveness and oversight are common 30-mark titles.

What Congress actually passes

Judge effectiveness partly by output. Congress still passes landmark laws: the Affordable Care Act (2010) remade health insurance, and the Inflation Reduction Act (2022) was the largest climate investment in US history. The criticism: both passed with only one party's votes, so landmark laws now tend to need unified government, arriving in bursts when one party holds the House, Senate and White House and stalling otherwise.

Parties in Congress: the changing significance

The specification asks how the roles and powers of Congress are changing, and the parties are the biggest change. Hyperpartisanship means members now vote the party line far more often than a generation ago, and the cross-party coalitions that once built majorities have nearly disappeared. There are exceptions: the 2021 infrastructure act passed with votes from both parties. But the rule is that party control, not argument on the floor, now decides what Congress can do.

Map Timeline (interactive roller)
Helpful context

How the balance between Congress and the President has shifted.

Roll through the timeline1 / 6
1787Article I
1933New Deal
1973War Powers
1974Budget Act
1995Shutdown
2021Jan 6
1787

Article I. Congress is created as the first branch, with the power of the purse and lawmaking.

1933

The New Deal. Power flows to the President; Congress delegates heavily during the Depression.

1973

War Powers Resolution. Congress tries to reclaim war-making power after Vietnam.

1974

Budget and Impoundment Act. Congress strengthens its control of spending against the President.

1995

Government shutdown. Divided government and the power of the purse produce deadlock.

2021

January 6 committee. High-profile oversight of the executive, but limited legislative power to act.

Roll up and down: the arrows, scroll or swipe inside the box, the up and down keys, or click a year above. Full interactive timeline on Panther →

Diag Diagram: how a bill dies (and sometimes becomes law)
How a bill dies (and sometimes becomes law) Bill introducedthousands per year CommitteeKILL POINT: most die here House floor votesimple majority Senate filibusterKILL POINT: 60 votes to end Senate floor votesimple majority Both chambers agreeidentical text required Presidential vetoKILL POINT LAWsigned, or veto overridden Override needs two thirds of BOTH chambers - rare. Divided government turns every stage into a kill point: the 118th Congress (2023-24) was among the least productive in modern history. UK comparison: a conveyor belt, not an obstacle course Commons stagesgovernment majority Lordsdelay only, not veto Royal Assentautomatic The government controls the timetable and whips its majority, so almost all government bills become law. The US system was designed to make passing law hard; the UK system makes it easy.

Exam use: this is the structural answer to "why does Congress legislate so little". Each red box is an AO2 point, and the UK strip is the ready-made 12-mark comparison.

Diag Diagram: House against Senate
One Congress, two very different chambers HOUSE OF REPRESENTATIVES 435 members - 2-year terms - districts SENATE 100 members - 6-year staggered terms - whole states Exclusive powers Begins all revenue (tax) bills Impeaches (brings the charges) Chooses the President if the College deadlocks Character: majoritarian - the Speaker's rules committee dominates; the majority gets its way Exclusive powers Tries impeachments (two-thirds to convict) Confirms appointments - judges, cabinet Ratifies treaties (two-thirds) Character: individualist - the filibuster means 60 votes in practice; one senator can slow everything Equal where it matters most Both chambers must pass identical text for any bill to become law, and both must vote by two-thirds to override a veto or propose an amendment. Unlike the Lords, the Senate is a full equal - in treaty and confirmation power, the stronger chamber. Comparison bank: 2021 Q2 asked how the Senate has greater power than the Lords: elected and equal against appointed and delaying; confirmation and ratification against scrutiny and revision; six-year statewide mandates against no mandate at all. Watch the trend: hyperpartisanship is making the House's discipline look more like the UK Commons, while the Senate stays the brake.

Exam use: the exclusive-powers boxes are the AO1 backbone for any Congress question, and the bottom strip is a ready 12-mark Senate-v-Lords answer.

Plan Where the essays come from

Each row takes an evaluative demand the specification makes in this area, quoted word for word, and shows the 30-mark question it tends to become. Learn both sides for every row.

The spec wordingThe question this becomesThe two sides in one line
"powers given to Congress in the Constitution, the exclusive powers of each House and the concurrent powers of Congress"Evaluate the view that the constitutional powers of Congress remain significant.Yes: the purse, confirmation and the override are powers no president can ignore. No: war powers and policy leadership have drained away to the presidency.
"The legislative process, including the strengths and weaknesses of this process"Evaluate the view that the legislative process in Congress needs major reform.Yes: the filibuster and gridlock kill most bills before a vote. No: a slow, blocking process is what the Framers built on purpose.
"The policy significance of Congress - impact and effectiveness of laws passed"Evaluate the view that Congress is no longer an effective lawmaker.Yes: landmark laws are now rare and budgets pass by crisis deadline. No: recent Congresses still passed major laws on infrastructure and health.
"The checks on the other branches of government and the extent of its institutional effectiveness"Evaluate the view that congressional oversight of the executive is weak.Yes: party loyalty turns oversight on or off with the political wind. No: hearings, investigations and confirmations still bite, whoever governs.
"debates about adequacy of its representative role"Evaluate the view that Congress fails to represent the American people.Yes: safe seats and donor influence detach members from voters. No: members answer to their districts every two years and vote accordingly.
"Changing significance of parties in Congress"Evaluate the view that party is now the most important influence on voting in Congress.Yes: polarisation has made party-line voting the norm in both chambers. No: constituency pressure still beats party when the two collide.
Sum Section summary - the must-knows
1Facts most worth memorising
  • Congress is bicameral: the House (population) and the Senate (two per state).
  • House terms are two years; Senate terms six.
  • The Senate alone confirms appointments and ratifies treaties.
  • Revenue bills start in the House.
  • The power of the purse is Congress's strongest check.
  • Congress can override a veto with two-thirds of both houses.
  • The filibuster needs 60 Senate votes to overcome.
  • The War Powers Resolution (1973) tried to limit presidential war-making.
  • Congress is more independent of the executive than the UK Parliament.
  • Gerrymandering and incumbency weaken representation.
2Examples most worth memorising
  • The filibuster
  • Senate confirmation of Barrett (2020)
  • The power of the purse
  • Divided government after the 2022 midterms
  • The January 6 committee
  • Overriding a presidential veto
  • The debt-ceiling standoffs
  • The War Powers Resolution (1973)
3Evaluation points most worth memorising
  • Separation of powers makes Congress strong but prone to gridlock.
  • Oversight is real but often partisan.
  • Representation is distorted by districting and incumbency.
  • Congress checks foreign policy through funding and oversight, not command.
  • Compared with Parliament, Congress is independent but slower.
4Examiner warnings to act on
  • Distinguish the House from the Senate precisely.
  • Do not treat Congress like the UK Parliament.
  • Weigh effectiveness against gridlock.
  • Use named oversight examples.
  • Reach a clear judgement on the comparison.
5Strongest essay arguments
  • Congress is powerful but gridlocked by separation of powers.
  • Its strongest check is the power of the purse.
  • It is more independent of the executive than Parliament.
  • Oversight works but is shaped by partisanship.
Test Section test - 12 questions

Twelve mixed questions covering the whole section. Your most recent score is shown in the top bar.

Practise this topic on Panther
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