UK and USA Constitutions (AQA A-Level Politics): Revision Notes
UK and USA Constitutions
Understanding the similarities and differences between the UK and US constitutions is fundamental to grasping how government works in both countries. While they share common goals of creating democratic frameworks and protecting individual rights, their structures and approaches differ significantly.
Why compare constitutions?
Both constitutions have evolved without revolutionary upheaval in recent history, unlike France or Germany. They both establish democratic politics, accountable institutions, and protect individual rights. However, the location of sovereignty and the nature of checks and balances differ substantially. These constitutions face criticism from across the political spectrum about the balance between accountability and effective governance.
Comparative theories
When analyzing constitutional differences, political scientists use three theoretical frameworks. Each offers a different lens for understanding how political systems work.
Structural theory focuses on institutions and their formal structure. This approach examines the outward appearance and official rules of government institutions. It's particularly useful for analyzing constitutions and legislatures. For example, structural analysis would examine how constitutions can be amended or what powers different legislative chambers possess. Think of this as the "script" of politics.
Rational theory concentrates on the actions and behaviors of groups and individuals. This approach examines what political tactics make logical sense in any given situation. It's especially helpful for studying voting behavior and pressure group methods. This theory represents the "actors" in the political drama.
Cultural theory emphasizes history, shared values and cultural context. This perspective is particularly relevant when examining constitutional origins, traditional values of political parties, and how legislatures have developed over time. This theory could be seen as the "production process" leading to the political performance.
Key structural differences
The UK and US constitutions differ fundamentally in their nature and structure. Understanding these core differences is essential for comparing how each system operates.
| Feature | British Constitution | US Constitution |
|---|---|---|
| Codification | Uncodified - drawn from multiple sources including statutes, conventions, and common law | Codified - written in a single authoritative document ratified in 1787 |
| Amendment process | Flexible - can be changed through Acts of Parliament by simple majority | Rigid - requires supermajorities in both chambers of Congress and approval from three-quarters of states |
| Updating outdated clauses | Easy to change anachronistic provisions that no longer seem relevant | Much harder to remove or revise historic clauses no longer appropriate for the twenty-first century |
| Sovereignty | Parliamentary sovereignty - Parliament (Crown in Parliament) is supreme | Constitutional sovereignty - the Constitution itself is supreme |
| Clarity | Often lacks precision; convention fills gaps where entrenched procedures are absent. Some piecemeal codification exists (e.g., Cabinet Manual) | Articles are precise in places about roles and duties of each branch, though some terminology remains vague |
Critical terminology distinction: The UK Constitution is uncodified, not "unwritten". Much of it is actually written down in various statutes and documents. Similarly, the US Constitution is codified, not simply "written". This terminology matters in exams and demonstrates precise understanding of constitutional theory.
Codification explained
Codification means the constitution is written in a single, authoritative document. The US Constitution, ratified in 1787, fits this description. It can be physically held and read as one complete text.
Uncodified means the constitution comes from multiple sources. The UK Constitution draws from statute law (like the Human Rights Act 1998), common law, conventions (like collective ministerial responsibility), and historic documents (like Magna Carta 1215). No single document contains the entire constitution.
The UK's uncodified nature offers flexibility but can create confusion about what exactly the constitution says. The US's codified approach provides clarity but can make the constitution harder to update when society changes. Both approaches have advantages and disadvantages in practice.
Amendment processes
The UK's flexible constitution means Parliament can amend constitutional arrangements through ordinary legislation. For example, the Fixed-term Parliaments Act 2011 changed when elections occur, and the Early Parliamentary General Election Act 2019 effectively repealed it. This requires only a simple majority in the Commons and Lords.
The US's rigid constitution requires extraordinary procedures for amendment. A proposed amendment needs two-thirds support in both the House of Representatives and Senate, then ratification by three-quarters of state legislatures (38 out of 50 states). This high bar explains why only 27 amendments have been ratified since 1787.
Real-World Example: Constitutional Amendment Difficulty
The US Constitution's rigidity means outdated provisions remain in place. For instance, the Electoral College system has survived numerous reform attempts despite criticism. In contrast, the UK easily passed the House of Lords Act 1999, removing most hereditary peers from the Lords through ordinary legislation - something unimaginable in the rigid US system.
Separation versus fusion of powers
A critical difference lies in how power is distributed across government branches, fundamentally shaping how each system operates.
Power Distribution Models
The USA has a deliberate separation of powers. The executive (President), legislative (Congress), and judicial (Supreme Court) branches are constitutionally separate. Members of Congress cannot serve in the executive branch simultaneously. This creates distinct centers of power that can check each other.
The UK features fusion of powers. The executive (Prime Minister and Cabinet) sits within the legislature (Parliament). Government ministers must be MPs or Lords. Whoever controls Parliament controls the nation, creating concentrated power when one party has a large Commons majority.
Implications for executive power
In the UK, a prime minister with a substantial majority can usually pass their legislative agenda with minimal obstruction. Between elections and with a weak House of Lords, this creates what some call an elective dictatorship - few formal checks exist on executive power. However, backbench rebellions can constrain prime ministers, as Theresa May discovered with Brexit legislation.
Real-World Example: Boris Johnson's Prorogation (2019)
Boris Johnson's attempted prorogation of Parliament in 2019 was ruled unlawful by the Supreme Court, showing courts can occasionally intervene even in the UK's parliamentary sovereignty system. This demonstrated that even with fusion of powers, some limits exist on executive action.
In the USA, even presidents controlling both congressional chambers face difficulties. Donald Trump held unified Republican control of Congress (2016-2018) but struggled to pass major legislation.
Real-World Example: Trump's Healthcare Reform Failure (2017)
The American Health Care Act 2017, which would have repealed Obamacare, failed despite Republican majorities in both chambers. Presidents must constantly negotiate with and persuade congressional leaders, even from their own party. The separation of powers creates multiple "veto points" where legislation can be blocked.
How the constitutions work in practice
Beyond formal structures, both constitutions operate within similar political realities, though important differences remain. Understanding these practical differences helps explain why seemingly similar democratic systems produce different political outcomes.
| Feature | Similarities | Differences |
|---|---|---|
| Legislative power | Elected legislatures pass all national/federal laws. Pressure groups focus lobbying efforts on parliament and Congress accordingly. | UK lobbying concentrates almost entirely on the House of Commons. In the USA, lobbyists target both Senate and House equally due to their legislative equality. |
| Executive power | Both executives play significant roles in setting political agendas. Prime ministers and presidents use slogans like "Get Brexit Done" or "Make America Great Again" to frame political debate. | UK prime ministers with healthy majorities normally pass their agenda through Parliament without major incident. US presidents must negotiate carefully with congressional leaders, even from their own party. Boris Johnson pushed through Brexit legislation in 2020, while Donald Trump struggled to secure billions for his proposed Mexican border wall. |
| Limits on power | Neither president nor prime minister is truly imperial. UK prime ministers face backbench rebellions. US presidents often face uncooperative Congresses. | Checks and balances are embedded in the US system through vetoes and supermajority requirements. The UK lacks these formal mechanisms. Presidential vetoes remain common; royal assent hasn't been denied since 1707. |
| Judiciary | Courts in both countries can rule against legislatures and executives. UK courts have ruled anti-terror legislation incompatible with the European Convention on Human Rights. The US Supreme Court struck down the line-item veto and parts of the Bipartisan Campaign Reform Act 2002 in the Citizens United case (2010). | The US judiciary is far more powerful in shaping the modern state. Landmark Supreme Court cases are central to American constitutional history. UK courts cannot rule Acts of Parliament unconstitutional - they issue only "declarations of incompatibility" regarding EU law (until 2020) or the ECHR. This reflects the fundamental difference between constitutional and parliamentary sovereignty. US Supreme Court is a major lobbying target through amicus curiae briefs. |
| Devolved/federal government | Much decision-making occurs beyond Westminster and Washington DC. Regional assemblies and state capitols are important. Both are targets for campaigning and pressure group influence. | UK devolution, while growing in significance, remains far less important than America's wholly federal structure. State legislature and governorship elections are heavily contested in the USA and represent major access points for pressure groups. |
Political parties and pressure groups
Political parties dominate both systems. In the UK, party discipline is generally stronger, with MPs typically voting along party lines. In the USA, party discipline is weaker - members of Congress have more independence from party leadership.
Pressure groups operate in both countries but with different strategies. In the UK, groups primarily target government ministers and the House of Commons, since the executive dominates the legislature. In the USA, groups must lobby multiple power centers: both congressional chambers, the President, and potentially the Supreme Court through amicus curiae ("friend of the court") briefs.
Lobbying Strategy Differences
The structural differences between the constitutions directly shape pressure group tactics. US groups must spread resources across multiple targets (House, Senate, President, Supreme Court), while UK groups can concentrate efforts on the government and Commons. This makes UK lobbying potentially more efficient but also creates a single point of failure if groups cannot influence the governing party.
Cultural and historical context
The constitutions' different natures reflect their distinct origins and historical development. Understanding these cultural and historical factors helps explain why two democratic systems evolved such different constitutional approaches.
Principles and origins
The US Constitution was deliberately formulated in 1787 with clear principles: republicanism, representative government, and checks on power. It emerged from revolution against British rule and replaced the failed Articles of Confederation. The Founding Fathers consciously created a new system based partly on ideas from ancient Rome and Greece (hence "Senate" and "republic").
The UK Constitution evolved gradually over centuries. Parliamentary government emerged from the Glorious Revolution (1689). Democratic expansion occurred incrementally through Reform Acts from 1832 onwards. The constitution adapted to mass democracy without revolutionary rupture. It remains essentially monarchical in structure, though the monarch's role is now largely ceremonial.
Heritage and tradition
The UK Constitution retains hereditary elements and deference to tradition. The House of Lords includes hereditary peers and 26 bishops of the Church of England. While not strictly logical, this isn't seen as a major democratic deficit. Constitutional documents like Magna Carta (1215) remain symbolically important. Even chamber names - Lords and Commons - reflect historic class distinctions.
The US Constitution deliberately rejected hereditary principles. No titles of nobility exist. The system drew inspiration from classical republicanism rather than monarchy. This reflects the revolutionary break from British colonial rule.
Individual rights
Both constitutions value individual rights but approach them differently, reflecting their distinct historical experiences and philosophical foundations.
The US Constitution explicitly protects rights through the Bill of Rights (first ten amendments, ratified 1791) and subsequent amendments. Americans have historically shown strong attachment to individual liberty, particularly First Amendment freedoms and Second Amendment gun rights.
The UK also has historic attachment to civil liberties. Magna Carta limited the monarch's ability to deny justice. The Bill of Rights 1689 restricted royal power over Parliament. However, these documents didn't originally protect rights for all. Magna Carta was an agreement between King John and barons. The 1689 Bill of Rights protected Parliament, not necessarily individual citizens.
Historical Context: Limited Original Rights
Similarly, the Philadelphia Constitutional Convention (1787) involved a white colonial male elite drafting rules reflecting their priorities. Neither constitution initially intended to protect rights for all people - both excluded women, and the US Constitution infamously accommodated slavery.
That both constitutions adapted over time to extend rights more broadly (through amendments in the USA, through new legislation like the Equality Act 2010 in the UK) demonstrates their flexibility and the vision of original drafters who created frameworks capable of evolution.
Key Points to Remember:
- The UK has an uncodified, flexible constitution with parliamentary sovereignty; the USA has a codified, rigid constitution with constitutional sovereignty
- The UK features fusion of powers (executive within legislature); the USA has separation of powers (distinct branches)
- Structural theory examines formal institutions; rational theory focuses on behavior of actors; cultural theory emphasizes historical context
- UK prime ministers with large majorities have few formal checks; US presidents face multiple veto points even with congressional support
- The US Supreme Court is far more powerful than UK courts because it can strike down legislation as unconstitutional
- Both constitutions evolved to accommodate mass democracy without revolutionary upheaval, unlike France or Germany
- The terminology matters: UK constitution is uncodified (not "unwritten"), US constitution is codified (not just "written")
- Elective dictatorship in the UK means concentrated power between elections, while US separation of powers creates ongoing checks