Comparative US/UK Legislatures: Congress and Parliament
Comparing Congress and Parliament means comparing two bicameral legislatures built on opposite constitutional logics: the separation of powers in the USA versus the fusion of powers in the UK.
Before you start
Make sure you're comfortable with these topics first:
Method
- Plan comparative paragraphs by theme, e.g. one paragraph on bicameral balance, one on party discipline, one on committee power, rather than one paragraph describing Congress fully and a separate one describing Parliament.
- Learn the core structural difference precisely: separation of powers bars members of Congress from also holding executive office, while the fusion of powers in the UK requires government ministers to be sitting MPs or peers.
- Learn the bicameral balance difference: the Senate is constitutionally co-equal to the House, with exclusive powers such as treaty ratification and confirming nominations, while the House of Lords can only delay most legislation under the Parliament Acts (1911 and 1949) and defers to the Commons under the Salisbury Convention on manifesto commitments.
- Learn the party discipline difference and its rational explanation: UK party discipline is typically stronger because a government's survival depends on maintaining Commons confidence and because party leadership controls candidate selection and promotion, giving MPs a direct interest in loyalty, whereas in the US, primary elections mean voters, not party leadership, largely control a member of Congress's political survival, weakening the leadership's rational hold over individual votes.
- Learn the committee-power difference: US standing committees are more specialised and independently powerful, able to block or substantially rewrite legislation, while UK select committees scrutinise government but have comparatively less direct power over the content or passage of legislation.
- In every comparative paragraph, name the theory being applied (structural, rational or cultural) explicitly rather than leaving the comparative reasoning implicit; an implicit comparison without a named theory scores below one that states, for example, 'this is best explained by the rational approach because...'.
Worked example
Using the rational approach, explain why party discipline is typically stronger in the UK Parliament than in the US Congress.
- State the rational approach first: it explains political behaviour as the product of actors pursuing their own self-interest within the rules and incentives they face, so party discipline should be explained by asking what each system rewards or punishes.
- Apply it to the UK: a UK government's survival depends on maintaining the confidence of the Commons, and a sitting MP's chance of ministerial promotion, and even reselection as a candidate, depends heavily on party leadership approval, so MPs have a strong rational incentive to vote with the whip.
- Apply it to the USA: because candidates for Congress are chosen through primary elections in which ordinary voters, not party leaders, decide the nominee, a member of Congress's political survival depends more on their own constituency and fundraising base than on the approval of congressional party leadership, weakening the leadership's ability to compel loyalty.
- Draw the direct comparison: in both cases, members are behaving rationally in their own self-interest, but the different rules for gaining and keeping office (leadership-controlled promotion and deselection in the UK versus primary-controlled nomination in the USA) produce systematically different, and rationally explicable, levels of party discipline.
- Conclude by stating explicitly that this is a rational, not a structural or cultural, explanation, since it rests on the incentives facing individual political actors rather than on the formal shape of the institutions themselves or on inherited political values.
Practice questions
Try each question, then tap to reveal the answer.
Q1What does 'fusion of powers' mean, and which country's system does it describe?Show answer
Answer: That the executive is drawn from and remains accountable to the legislature; it describes the UK system, where ministers must be sitting MPs or peers.
Q2Name one power the US Senate has that the House of Lords does not have.Show answer
Answer: Ratifying treaties (two-thirds vote) or confirming presidential nominations.
Q3What legislation limits the power of the House of Lords over the elected House of Commons?Show answer
Answer: The Parliament Acts of 1911 and 1949.
Q4Give one reason, using the rational approach, that party discipline tends to be stronger in the UK than in the US Congress.Show answer
Answer: Because a UK MP's promotion and reselection depend heavily on party leadership approval, giving a rational incentive to vote loyally, whereas a member of Congress is chosen through primary elections controlled by voters rather than party leaders.
Q5Are US committee chairs generally more or less powerful than UK select committee chairs in shaping legislation?Show answer
Answer: More powerful; US standing committee chairs can block or substantially rewrite legislation, while UK select committees mainly scrutinise government rather than directly controlling legislative content.
Q6Can a member of Congress simultaneously serve as a cabinet secretary?Show answer
Answer: No, the separation of powers means a member of Congress must resign their seat to take an executive branch position.
Q7What comparative theory explains institutional differences by reference to formal constitutional structures?Show answer
Answer: The structural (institutional) approach.
Exam-style questions
Written in the style of a A Level Politics exam paper, with a full mark scheme.
Using the rational approach, explain why party discipline is typically stronger in the UK Parliament than in the US Congress.
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'A bicameral legislature is a more effective check on the executive in the USA than in the UK.' Evaluate this view, applying the comparative theories in your answer.
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