What is a constitution

Intuition [Beginner]

Think of a constitution as the operating manual for a government. Just as a sports league has a rulebook that says how teams are organized, how games are decided, and what happens when rules are broken, a constitution sets out:

• What the government can do
• What the government cannot do
• How power is divided and organized
• How the rules themselves can be changed

Not every country puts its constitution in a single document. The United Kingdom has a constitution spread across laws, court decisions, and unwritten conventions accumulated over centuries. The United States has one written document adopted in 1787 (plus 27 amendments). Both approaches work; they just work differently.

A constitution is the highest law in a country. If a regular law conflicts with the constitution, the constitution wins. This principle -- that some rules are harder to change than others and override ordinary legislation -- is what makes a constitution different from a regular law.

Visual [Beginner]

Written vs. unwritten constitutions

Feature	Written (codified)	Unwritten (uncodified)
Single document?	Yes -- one text is the supreme law	No -- principles spread across statutes, cases, conventions
Examples	US, India, Germany, France, Japan	UK, New Zealand, Israel (partial)
Entrenchment	Usually requires special process to amend	Can be changed by ordinary legislation
Judicial review	Courts can strike down laws that violate the constitution	Courts interpret statutes but parliamentary sovereignty limits striking down laws
Advantages	Clarity, certainty, strong rights protection	Flexibility, adaptability, evolutionary change
Disadvantages	Rigidity, judicial supremacy, difficulty updating	Uncertainty, weaker protection against legislative overreach

How constitutions are amended

Country	Amendment process	Difficulty
US	2/3 of both houses + 3/4 of states	Very difficult (only 27 amendments in 230+ years)
Germany	2/3 of Bundestag + 2/3 of Bundesrat	Difficult, but managed over 50 times
India	Varies: some amendments need simple majority, some need 2/3 + state ratification	Moderate
UK	Parliament passes a regular law	Easy (no formal entrenchment)
Japan	2/3 of both houses + majority in referendum	Very difficult (never amended since 1947)
Australia	Absolute majority of both houses + majority of voters in majority of states	Difficult (most referendums fail)
Switzerland	Majority of voters + majority of cantons	Direct democratic participation

Worked example [Beginner]

Compare how the US and the UK handle a constitutional change:

The US Constitution and the Equal Rights Amendment. In 1972, Congress passed a proposed amendment stating that "equality of rights under the law shall not be denied or abridged... on account of sex." To become part of the Constitution, it needed ratification by 38 states. By the 1982 deadline, only 35 states had ratified. The amendment failed. More than 50 years later, it is still not part of the Constitution, even though a majority of Americans support it. The difficulty of the amendment process means that even widely supported changes can fail.

The UK and the Human Rights Act 1998. The UK incorporated the European Convention on Human Rights into domestic law by passing a regular statute through Parliament. No supermajority, no state ratification, no referendum. Parliament could similarly repeal or modify the Act by passing another law. The change was made quickly; it could also be undone quickly.

These two approaches reflect different values: the US prioritizes stability and protection against temporary majorities; the UK prioritizes flexibility and parliamentary sovereignty.

Check your understanding [Beginner]

Formal definition [Intermediate+]

A constitution is a set of fundamental rules, whether written or unwritten, that:

1. Establishes and limits the organs of government.
2. Defines the relationship between the state and individuals (rights and obligations).
3. Regulates the relationships among government organs (separation of powers, federalism).
4. Specifies how the rules themselves may be changed (amendment procedures).

Key analytical distinctions:

• Codified vs. uncodified: whether the fundamental rules are gathered in a single document or dispersed across multiple sources.
• Rigid vs. flexible: whether the fundamental rules are harder to change than ordinary law (rigid) or can be changed by the same process as any other law (flexible).
• Nominal vs. effective: whether the constitution accurately describes how power is exercised (effective) or presents an aspirational picture that differs from reality (nominal). Loewenstein (1957) classified constitutions as normative (effectively enforced), nominal (present but not enforced, often in transitional states), and semantic (a façade that describes existing power arrangements without limiting them).

Constitutionalism is the broader principle that government should be limited by law -- that those who exercise power are subject to rules they did not create and cannot unilaterally change. A constitution is one instrument of constitutionalism, but not the only one. A country can have a constitution without constitutionalism (if the document is ignored), and some scholars argue that the UK practices constitutionalism effectively without a single codified document.

Parliamentary sovereignty (the UK doctrine): Parliament has the right to make or unmake any law, and no person or body can override or set aside Parliament's legislation. This is a strong form of legislative supremacy. It contrasts with constitutional supremacy (the US model), where the constitution is the supreme law and even the legislature is bound by it.

Key concepts [Intermediate+]

Constitutional conventions (UK and Westminster systems): Unwritten rules that are politically binding but not legally enforceable. Examples:

• The monarch appoints as prime minister the person who commands a majority in the House of Commons (convention, not law).
• Ministers resign if they mislead Parliament (convention, though the Ministerial Code now partially codifies this).
• The House of Lords does not veto legislation promised in the governing party's election manifesto (the Salisbury Convention).

Conventions matter because they fill gaps that written rules leave open. They are enforced by political pressure, not courts. If a convention is broken, the consequence is political scandal or constitutional crisis, not legal sanction.

Constitutional monarchy: A system where a hereditary monarch serves as head of state but exercises power only on the advice of elected ministers. The monarch's role is defined and limited by the constitution (whether written or unwritten). Examples: UK, Spain, Netherlands, Sweden, Japan, Thailand, Jordan, Morocco.

Feature	Constitutional monarchy	Absolute monarchy
Head of state	Hereditary monarch	Hereditary monarch
Political power	Exercised by elected officials	Exercised by monarch
Constitutional limits	Yes	Minimal or none
Examples	UK, Japan, Spain	Saudi Arabia, Eswatini

Judicial review of constitutional amendments: Some countries (Germany, India, South Africa) allow courts to review not just ordinary laws but constitutional amendments themselves, on grounds that they violate the constitution's "basic structure" or fundamental principles. This is controversial: if the people (through their representatives) amend the constitution, can unelected judges override them? India's "basic structure doctrine" (Kesavananda Bharati v. State of Kerala, 1973) holds that Parliament can amend the Constitution but cannot alter its basic structure (democracy, secularism, judicial review, federalism). Germany's Basic Law contains an "eternity clause" (Article 79(3)) stating that certain principles can never be amended, even by a supermajority.

Exercises

Exercise 1. Country A has a written constitution with a bill of rights, but the courts cannot review legislation for constitutionality. Country B has no written constitution, but courts have developed common law rights protections that bind the government. Which country has stronger constitutionalism in practice?

Reveal

Country B likely has stronger constitutionalism in practice. Constitutionalism is about effective limits on government power, not about whether those limits are in a single document. If Country A's constitution is unenforceable -- if no institution can hold the government to its promises -- then the written text provides no real constraint. Country B's common law rights, while less formal, are judicially enforceable and therefore provide actual limits on government action. This does not mean an uncodified system is always better, but it illustrates that the form of a constitution matters less than its enforcement.

Exercise 2. Explain the "basic structure" doctrine and why it is controversial. Should courts be able to strike down constitutional amendments?

Reveal

The basic structure doctrine (established in India) holds that certain fundamental features of the constitution cannot be amended even through the formal amendment process. These include democracy, secularism, the rule of law, judicial review, and federalism. The argument in favor is that majoritarian processes should not be able to destroy the constitutional framework itself -- a temporary majority should not be able to permanently eliminate democracy. The argument against is that it places unelected judges above the democratic will of the people, since constitutional amendments already require supermajorities. This is a core tension in constitutional theory between popular sovereignty and constitutional supremacy.

Political theory [Master]

Constitutionalism and the rule of law. The idea that government should be constrained by pre-existing rules is not self-evident. It rests on several theoretical commitments:

• Limited government: there are things the government may not do, even if a majority supports doing them. This is a substantive commitment, not just a procedural one.
• Predictability: rules established in advance allow individuals and organizations to plan their affairs. Dicey (1885) argued that the rule of law requires that government power be exercised according to known principles, not arbitrary discretion.
• Rights as trumps (Dworkin, 1977): individual rights are not merely policy considerations to be balanced against collective goals; they are constraints on what the government may do, even in pursuit of legitimate collective aims.

Originalism vs. living constitutionalism. In systems with written constitutions, a central debate is how to interpret old texts in new circumstances:

• Originalism (Scalia, Bork): the constitution should be interpreted according to the original public meaning of the text at the time it was adopted. The advantage is that it constrains judges from imposing their own values. The criticism is that it ties a modern society to the understandings of people who lived centuries ago, many of whom held views now considered unacceptable (slavery, limited suffrage).
• Living constitutionalism (Breyer, Strauss): the constitution should be interpreted in light of evolving societal values and contemporary circumstances. The advantage is adaptability. The criticism is that it gives too much discretion to unelected judges, undermining democratic self-governance.
• Purposivism (Dworkin, Barber): interprets the constitution according to the purposes or principles underlying its provisions, rather than either the specific historical expectations or current majority opinion. This approach seeks a middle ground.

Constitution-making and legitimacy. Where do constitutions get their authority? Three main answers:

1. Democratic authorization: a constitution is legitimate because it was adopted through a democratic process (a constituent assembly, a referendum). The South African Constitution (1996) is often cited as exemplary because it was drafted through extensive public participation and adopted by an elected constitutional assembly.
2. Performance legitimacy: a constitution is legitimate because it works -- it produces stable government, protects rights, and commands general acceptance over time. The US Constitution's longevity is sometimes cited as evidence of its legitimacy, though this argument is circular (it has lasted because it is legitimate; it is legitimate because it has lasted).
3. International recognition: in practice, a new constitution's legitimacy is partly established by international acceptance -- other states recognizing the regime, international organizations accepting its validity. This is particularly relevant for post-conflict constitutions imposed or brokered by international actors (e.g., the Dayton Accords for Bosnia).

Transitional constitutions. Constitutions adopted after authoritarian rule or violent conflict face distinctive challenges. They must simultaneously establish democratic governance, address past injustices, manage deep social divisions, and create institutions that will survive the founding moment. Scholars like Ackerman (1991) and Elster (1995) have studied the politics of constitution-making, noting that constitutional moments -- periods of heightened popular engagement with fundamental political questions -- are rare and create both opportunities and dangers.

Constitutional design and ethnic conflict. In divided societies, constitutional design choices can exacerbate or mitigate conflict:

• Power-sharing (consociationalism, Lijphart): grand coalitions, mutual veto, proportionality, segmental autonomy.
• Integration (Horowitz): incentives for inter-ethnic cooperation through electoral systems (vote pooling, required distributional thresholds).
• These approaches are not merely technical; they embody different theories about whether ethnic identity is fixed and must be accommodated (consociationalism) or can be made politically irrelevant through the right institutional incentives (integration).

Historical context [Master]

Early constitutional documents. Magna Carta (1215) limited the English king's power and established that even the monarch was subject to law, though its original scope was narrow (baronial rights, not popular rights). The Golden Bull of Hungary (1222) similarly limited royal power. The Iroquois Confederacy's Great Law of Peace is sometimes cited as an indigenous constitutional tradition predating European models.

The Enlightenment and written constitutions. The idea that government should be organized according to a single written document gained currency in the 18th century. The US Constitution (1787) was the first national written constitution still in use. The French Revolutionary constitutions (1791, 1793, 1795, 1799) reflected the instability of constitutional government during revolutionary periods. The Polish Constitution of May 3, 1791 was the first in Europe.

19th century constitutionalism. The spread of constitutional government was a defining feature of the 19th century. Latin American independence movements produced constitutions modeled on the US and Spanish examples (often with limited practical effect). The Meiji Constitution of Japan (1889) imported Western constitutional forms while preserving imperial sovereignty. Most European states adopted constitutions during this period, though many were granted by monarchs (octroyed) rather than adopted by popular assemblies.

Post-1945 constitutional design. The post-war period saw a wave of constitution-making. Germany's Basic Law (1949) was designed explicitly to prevent the democratic breakdown that had brought the Nazis to power: an "eternity clause," a strong constitutional court, constructive vote of no confidence, and federalism. Japan's 1947 constitution was drafted under American occupation and included Article 9 (renunciation of war) and extensive rights provisions. India's 1950 constitution was the world's longest, designed to govern a vast, diverse, newly independent country.

Post-Cold War constitution-making. The collapse of the Soviet Union and its satellite states produced another wave of constitution-making. South Africa's 1996 constitution is widely regarded as one of the most progressive, with extensive socio-economic rights and a constitutional court empowered to enforce them. Eastern European constitutions varied, with some (Poland, Hungary) initially strong but later weakened through constitutional manipulation.

21st century trends. Constitutional design has become a global industry, with international organizations and scholars advising new constitutions. Iceland's 2011 attempt to crowdsource a constitution (ultimately not adopted by Parliament) and Chile's 2020-2022 constitutional process (a draft rejected by referendum) illustrate both the possibilities and limits of participatory constitution-making.

Bibliography [Master]

• Ackerman, Bruce. 1991. We the People: Foundations. Harvard University Press.
• Dicey, A.V. 1885. Introduction to the Study of the Law of the Constitution. Macmillan.
• Dworkin, Ronald. 1977. Taking Rights Seriously. Harvard University Press.
• Elster, Jon. 1995. "Forces and Mechanisms in the Constitution-Making Process." Duke Law Journal 45(2): 364-396.
• Horowitz, Donald. 1985. Ethnic Groups in Conflict. University of California Press.
• Lijphart, Arend. 2004. "Constitutional Design for Divided Societies." Journal of Democracy 15(2): 96-109.
• Loewenstein, Karl. 1957. "Reflections on the Value of Constitutions in Our Revolutionary Age." In Constitutions and Constitutional Trends after World War II, ed. A.J. Zurcher. New York University Press.
• Strauss, David. 2010. The Living Constitution. Oxford University Press.
• Versteeg, Mila, and Emily Zackin. 2014. "American Constitutional Exceptionalism Revisited." University of Chicago Law Review 81: 1641-1707.