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The comparative study of UK and US government and politics is a central component of Edexcel A-Level Politics Paper 3. This lesson synthesises the key comparative themes across all areas of study: constitutional frameworks, legislatures, executives, judiciaries, rights protection, elections, parties, and pressure groups. Mastering these comparisons is essential for achieving top marks in synoptic essays.
| Feature | United States | United Kingdom |
|---|---|---|
| Type | Codified - single authoritative document (1787) | Uncodified - drawn from multiple sources |
| Entrenchment | Entrenched - requires supermajority to amend (two-thirds of Congress + three-quarters of states) | Not entrenched - can be changed by simple Act of Parliament |
| Supreme law | Yes - the Constitution is the highest legal authority | No - parliamentary sovereignty means no law is supreme |
| Flexibility | Rigid - only 27 amendments in 230+ years | Flexible - constitutional changes made through ordinary legislation |
| Judicial review | Full - courts can strike down legislation | Limited - courts can declare incompatibility but not strike down Acts |
The US codified constitution provides certainty and protection of fundamental rights but at the cost of rigidity. The UK's uncodified constitution allows flexibility and democratic responsiveness but risks executive overreach and weak rights protection.
Key Analytical Point: Neither system is inherently superior. The US constitution has preserved democratic governance for over two centuries, but its rigidity means outdated provisions (such as the Electoral College) persist. The UK constitution has evolved organically but lacks the clear protections that a codified document provides.
| Feature | US Congress | UK Parliament |
|---|---|---|
| Bicameralism | Two co-equal chambers (House + Senate) | Asymmetric - Commons dominant, Lords subordinate |
| Executive relationship | Separated - President is not a member of Congress | Fused - PM and Cabinet sit in Parliament |
| Party discipline | Weak - members frequently cross party lines | Strong - whipping system enforces loyalty |
| Committee power | Strong - committees conduct detailed scrutiny, hold hearings, and shape legislation | Weaker - select committees can investigate but have limited legislative power |
| Legitimacy | Both chambers fully elected | Lords unelected - democratic deficit |
| Legislation | Both chambers must pass identical bills | Commons can override Lords (Parliament Acts 1911/1949) |
The US Senate is often considered one of the most powerful legislative chambers in the world:
By contrast, the House of Lords:
Congress is better equipped to check the executive due to the separation of powers, strong committees, and the ability of individual members to vote independently. However, these same features contribute to gridlock - Congress often fails to act on major issues. The UK Parliament is typically dominated by the executive, but the government can generally implement its programme without obstruction.
| Feature | US President | UK Prime Minister |
|---|---|---|
| Selection | Elected via Electoral College | Leader of the majority party; appointed by the monarch |
| Dual role | Head of state AND head of government | Head of government only |
| Fixed term | Yes - 4-year term (22nd Amendment: maximum 2 terms) | No - can call election or face vote of no confidence |
| Cabinet | Appointed from outside Congress; individually accountable | Drawn from Parliament; collective responsibility |
| Legislative control | None - cannot control Congress | High - party discipline and Commons majority |
| Removal | Impeachment only (extremely rare) | Vote of no confidence; party leadership challenge; resignation |
The President has greater formal powers (commander-in-chief, executive orders, veto, pardon) but faces stronger institutional constraints (hostile Congress, judicial review, federalism). The PM has fewer formal powers but in practice wields greater day-to-day authority through control of the parliamentary majority and the whipping system.
Lord Hailsham's concept of an "elective dictatorship" captures the argument that a UK PM with a large Commons majority faces fewer effective checks than the US President. However, the PM's power is contingent on retaining the confidence of their party - as demonstrated by the removal of Margaret Thatcher (1990), Boris Johnson (2022), and Liz Truss (2022).
The President is strongest when:
The PM is strongest when:
The President is weakest when:
The PM is weakest when:
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