Unit 5: A Comparative Study of Constitutional Systems: Great Britain and the United States of America

1. Introduction to Comparative Constitutional Systems

A constitutional system defines the fundamental principles, political structures, institutional powers, and procedural rules that govern a nation. Comparing the constitutional frameworks of Great Britain (United Kingdom) and the United States of America (USA) provides an analysis of two major Western democratic models: the Anglo-Saxon Parliamentary system and the American Presidential system.

Definition of Constitutional System: The set of legal rules, political conventions, structural institutions, and underlying principles that establish the powers of state organs and regulate the relationship between the state and its citizens.

While both systems share a commitment to democracy, individual liberty, and the rule of law, they evolved through vastly different historical trajectories:

• Great Britain: Possesses an evolutionary constitution that developed organically over centuries through custom, common law, historical charters, and statutes without a single foundational rupture.
• United States: Built upon a revolutionary constitution drafted during the Constitutional Convention of 1787 in Philadelphia, designed deliberately to replace British monarchical rule with a written federal republic.

2. Nature and Form of the Constitution

The primary structural distinction between the British and American constitutional systems lies in their codified or uncodified status, and their relative flexibility or rigidity.

Uncodified vs. Codified Constitutions

Great Britain (Uncodified / Unwritten): The British Constitution is not contained within a single legal document. Instead, it derives from multiple sources:

• Statute Law: Acts passed by Parliament (e.g., Magna Carta 1215, Bill of Rights 1689, Parliament Acts 1911 and 1949, Human Rights Act 1998).
• Common Law: Judicial precedent and legal decisions developed by courts over time.
• Constitutional Conventions: Unwritten binding political rules and customs (e.g., the Prime Minister must be a member of the House of Commons).
• Royal Prerogative: Historic powers traditionally exercised by the Crown, now largely exercised by ministers.
• Works of Authority: Authoritative legal writings (e.g., A.V. Dicey's An Introduction to the Study of the Law of the Constitution).

United States (Codified / Written): The US Constitution is a single formal document comprising a Preamble, seven Articles, and 27 Amendments. It serves as the supreme law of the land under Article VI Clause 2 (The Supremacy Clause).

Flexible vs. Rigid Amendment Processes

Great Britain (Flexible): Because there is no legal hierarchy between constitutional laws and ordinary laws, the UK Parliament can amend or alter constitutional arrangements by passing a standard Act of Parliament through a simple majority vote.

United States (Rigid): Amending the US Constitution requires a complex, multi-stage procedure under Article V, ensuring that changes reflect broad national consensus:

1. Proposal Stage: Requires either a two-thirds (2/3) vote in both the House of Representatives and the Senate, or a national convention called by two-thirds (2/3) of state legislatures.
2. Ratification Stage: Requires approval by three-fourths (3/4) of state legislatures (38 out of 50 states) or by ratifying conventions in three-fourths of the states.

3. Territorial Structure: Unitary vs. Federal Systems

The territorial distribution of governmental power differs fundamentally between the British unitary state and the American federal republic.

The UK Unitary System

In a unitary state, ultimate sovereign authority is concentrated in the central government located at Westminster in London. Sub-national political bodies derive their authority entirely from the central parliament.

• Devolution: Since 1997, the UK Parliament has transferred specific legislative and administrative powers to decentralized assemblies in Scotland, Wales, and Northern Ireland.
• Key Principle: Devolution is non-sovereign delegation. Legally, the UK Parliament retains the power to modify, suspend, or revoke devolved powers at any time through standard legislation.

The US Federal System

In a federal system, constitutional power is divided between a central national government and regional state governments. Both levels of government enjoy constitutionally guaranteed autonomy.

• Enumerated Powers: Powers specifically granted to the federal government by Article I Section 8 of the Constitution (e.g., defense, foreign policy, interstate commerce, coining money).
• Reserved Powers: Under the Tenth Amendment, all powers not delegated to the federal government nor prohibited to the states are reserved to the individual states or to the people (e.g., local policing, education, public health).
• Dual Sovereignty: Neither the federal government nor state governments can unilaterally alter or abolish the constitutional boundary dividing their powers.

4. Executive-Legislative Relations: Fusion vs. Separation of Powers

The operational logic governing executive and legislative interaction in each nation relies on opposing structural models.

Great Britain: Fusion of Powers

The UK constitutional system operates on the principle of the fusion of powers within a parliamentary framework:

• The Prime Minister and Cabinet members are drawn directly from the legislative branch (House of Commons or House of Lords).
• The executive relies continuously on the confidence of the legislative majority to remain in power.
• If the House of Commons passes a vote of no confidence against the government, the Prime Minister and Cabinet must resign or dissolve Parliament to trigger a general election.

United States: Separation of Powers and Checks and Balances

The US constitutional system operates on a strict institutional separation of powers derived from Montesquieu's doctrine, establishing three distinct branches:

• Legislative: Congress (makes laws).
• Executive: President (enforces laws).
• Judicial: Supreme Court and federal courts (interprets laws).

System of Checks and Balances: Mechanism ensuring that no single branch gains total authority. Each branch possesses constitutional tools to limit the powers of the other two.

Key checks and balances in the US Constitution include:

• Executive Check on Legislature: The President can veto legislation passed by Congress. Congress can override a veto with a two-thirds (2/3) vote in both houses.
• Legislative Check on Executive: The Senate must confirm presidential appointments (judges, cabinet secretaries) and ratify treaties. Congress controls public finance ("power of the purse") and can impeach and remove the President.
• Judicial Check on Both: Federal courts can invalidate legislative statutes or executive actions found unconstitutional through judicial review.

5. Comparative Executive Systems

The structure, leadership, and tenure of the executive branch present contrasts between parliamentary cabinet government and presidential power.

The UK Dual Executive

The British executive is divided into two distinct components:

• Head of State (Constitutional Monarch): Represents symbolic and ceremonial continuity. Acts strictly on the advice of elected government ministers according to constitutional convention.
• Head of Government (Prime Minister): Holds political power. Leads the political party commanding a majority in the House of Commons and exercises executive prerogative powers.
• Collective Cabinet Responsibility: All Cabinet ministers must publicly support government decisions made collectively, or resign from office if they disagree.

The US Single Executive

The US combines head of state and head of government functions into a single office:

• The President: Functions simultaneously as Head of State, Head of Government, and Commander-in-Chief of the Armed Forces.
• Tenure: Serves a fixed four-year term, limited to two terms under the Twenty-Second Amendment.
• Presidential Cabinet: Composed of heads of executive departments appointed by the President with Senate confirmation. Cabinet members cannot simultaneously serve in Congress, and they advise the President rather than exercising collective decision-making power.

6. Comparative Legislative Systems and Sovereignty

Both countries feature bicameral legislatures, but their authority, composition, and internal power balances differ.

The UK Parliament

Composed of the Sovereign, the House of Commons (elected lower house), and the House of Lords (unelected upper house containing life peers and bishops):

• Asymmetric Bicameralism: The House of Commons is the dominant legislative body. Under the Parliament Acts of 1911 and 1949, the House of Lords cannot reject money bills and can only delay ordinary legislation for up to one year.
• Principle of Parliamentary Sovereignty: Formulated by A.V. Dicey, this principle states that Parliament has the right to make or unmake any law whatsoever, and no person or body is recognized by the law as having a right to override or set aside the legislation of Parliament.

Core Rules of Parliamentary Sovereignty:
1. Parliament can legislate on any subject matter.
2. No Parliament can bind its successors or be bound by its predecessors.
3. No court of law can declare an Act of Parliament invalid or unconstitutional.

The US Congress

Composed of two distinct, co-equal legislative chambers under Article I:

• House of Representatives: Lower house based on state population representation (435 members, serving two-year terms). Initiates revenue bills and impeachment proceedings.
• Senate: Upper house based on equal state representation (2 senators per state = 100 senators, serving six-year staggered terms). Approves treaties, confirms appointments, and tries impeachment cases.
• Symmetric Bicameralism: Both houses must pass identical legislative text for a bill to become law. Neither house dominates the legislative process.

7. Judiciary and Judicial Review

The power of national courts to review legislation reflects the fundamental norm of Constitutional Supremacy versus Parliamentary Sovereignty.

The US Judicial System and Full Judicial Review

The US judiciary operates under an independent system anchored by the Supreme Court established in Article III.

• Marbury v. Madison (1803): The landmark case in which Chief Justice John Marshall established the principle of judicial review.
• Power: Federal courts possess the legal power to review acts of Congress, executive actions, and state legislation. If a statute conflicts with the Constitution, the court declares it unconstitutional and null and void.

The UK Judicial System and Incompatible Declarations

The UK judicial system historically operated under the High Court of Parliament. The Constitutional Reform Act 2005 created an independent Supreme Court of the United Kingdom, which began operating in 2009.

• Limitation: UK courts operate under Parliamentary Sovereignty and cannot invalidate primary legislation passed by Parliament.
• Administrative Judicial Review: UK courts can review executive decisions and administrative actions to ensure they conform to statutory authority (preventing ultra vires acts).
• Human Rights Act 1998: Under Section 4, courts can issue a "Declaration of Incompatibility" if an Act of Parliament violates the European Convention on Human Rights. However, this declaration does not invalidate the statute; it informs Parliament, which retains the ultimate discretion to amend the law or leave it intact.

8. Fundamental Rights and Citizen Protection

The procedural safeguards protecting citizen rights reflect written guarantees versus statutory and common law traditions.

United States: Bill of Rights

• Citizen rights are explicitly codified in the first ten amendments to the US Constitution (The Bill of Rights), ratified in 1791.
• Includes protections such as freedom of speech, religion, and press (First Amendment), protection against unreasonable search and seizure (Fourth Amendment), due process (Fifth Amendment), and equal protection under the law (Fourteenth Amendment).
• Because these rights are constitutionally embedded, standard legislative majorities cannot override them.

Great Britain: Common Law and Statute

• Historically, British civil liberties relied on common law rights and residual freedom: citizens are free to do anything unless specifically prohibited by law.
• Statutory documents like Magna Carta (1215), the Bill of Rights (1689), and the Human Rights Act (1998) formalize protections.
• Because Parliament is sovereign, rights protected by statute can technically be altered or curtailed by a subsequent Act of Parliament.

9. Comprehensive Comparison Table

The table below summarizes the key differences across core constitutional parameters:

10. Exam-Oriented Notes, Definitions, and Common Mistakes

Essential Definitions to Memorize

• Parliamentary Sovereignty: The supreme legal authority of the UK Parliament to make or unmake any law without legislative restriction or judicial veto.
• Constitutional Supremacy: The legal doctrine established in Article VI of the US Constitution dictating that the written constitution overrides contradictory statutes or state laws.
• Judicial Review (US): The authority of federal courts to declare legislative acts or executive orders null and void if found inconsistent with the Constitution.
• Checks and Balances: Constitutional mechanisms in presidential systems allowing each branch of government to restrain the actions of the other branches.
• Devolution: The statutory delegation of decision-making powers from the central Parliament to sub-national bodies without relinquishing ultimate sovereignty.

Common Student Mistakes

• Mistake 1: Claiming the UK has "no constitution."
  Correction: The UK has a constitution, but it is uncodified and unwritten in a single document, drawing from statutes, conventions, and common law.
• Mistake 2: Believing the UK Supreme Court can strike down Acts of Parliament.
  Correction: Under Parliamentary Sovereignty, the UK Supreme Court cannot declare primary legislation void; it can only issue declarations of incompatibility under the Human Rights Act 1998 or review secondary executive actions.
• Mistake 3: Assuming the US President can dissolve Congress and call early elections.
  Correction: The US President has no constitutional power to dissolve Congress. Election dates are fixed by statute and the Constitution.
• Mistake 4: Confusing Devolution with Federalism.
  Correction: In federalism, power is constitutionally guaranteed to states and cannot be taken away unilaterally by the central government. In devolution, the central parliament creates devolved bodies and legally retains power to modify or abolish them.

Important Exam Observations

• In the UK, political stability depends heavily on constitutional conventions, unwritten customs, and self-restraint.
• In the US, stability is maintained through institutional design, codified rights, federal division of power, and judicial resolution of constitutional disputes.
• The Prime Minister is powerful when supported by a solid parliamentary majority, whereas the US President must frequently navigate a divided government where opposition parties control one or both houses of Congress.