2. Evolution of Modern Constitutions and Classification of Constitutions

Having seen what a Constitution is, this post traces how the modern written constitution came into being and lays out the standard ways constitutions are classified — the vocabulary you will use to describe the Indian Constitution for the rest of this course.

The Problem This Topic Solves

The idea of a single supreme written document is not something every civilization simply arrived at overnight — it took centuries of struggle between rulers and the ruled to settle. And once written constitutions became common, lawyers needed a shared vocabulary to compare them: is a constitution written or unwritten, easy or hard to amend, federal or unitary? This post builds both pieces — the history and the vocabulary — together.

Evolution of Modern Constitutions

Five milestones in the evolution of modern constitutions:

• 1215 — Magna Carta: earliest limit on royal power by written charter
• 1689 — English Bill of Rights: Parliament's supremacy over the Crown
• 1787 — US Constitution: world's first codified, written national constitution
• 1789 — French Declaration of the Rights of Man: popular sovereignty, inherent rights
• 19th–20th c. — Spread across Europe, Latin America, Asia and Africa, especially after decolonisation

1. Magna Carta, 1215 — Signed by King John of England, Magna Carta is widely treated as the earliest landmark limiting a ruler's power by a written charter — barons forced the king to accept that even he was not above certain basic rules. It did not create a modern constitution, but it planted the idea that royal power has limits.

2. English Bill of Rights, 1689 — Following the Glorious Revolution, this Act asserted the supremacy of Parliament over the Crown and listed specific rights of subjects (free elections, no cruel punishment, no taxation without Parliament's consent). England's constitution, however, remained — and remains — uncodified: a mix of statutes, conventions, and judicial decisions rather than one document.

3. The American Constitution, 1787 — The United States Constitution is generally recognized as the world's first codified, written national constitution: a single document, deliberately drafted at a convention, ratified by the states, and set up as the supreme law of the land. It became the model that later nations copied in form even where they differed in content.

4. The French Revolution and the Declaration of the Rights of Man, 1789 — The French Revolution contributed the idea that a constitution should rest on the sovereignty of the people rather than the divine right of a monarch, and that certain rights (liberty, property, security, resistance to oppression) are inherent and must be guaranteed in the constitutional text itself.

5. Nineteenth and twentieth century spread — Through the 1800s and 1900s, written constitutions spread across Europe, Latin America, and eventually Asia and Africa, often following revolutions, unifications, or the end of empire. Two waves mattered most for India's own story: the wave of new constitutions after the two World Wars, and the much larger wave that followed decolonization from the 1940s onward, when dozens of newly independent nations — India among the first and largest — adopted written constitutions of their own.

• Magna Carta (1215) is the earliest landmark limiting a ruler's power by written charter, but it is not itself a "constitution" in the modern sense
• The United States Constitution (1787) is the world's first codified, written national constitution and the model most later nations followed in form
• The French Declaration of the Rights of Man (1789) contributed the idea of popular sovereignty and inherent, guaranteed rights
• India's Constitution belongs to the post-decolonization wave of new written constitutions, adopted 26 November 1949

Classification of Constitutions

Once a constitution exists, it can be classified along several independent axes. India's own Constitution is best understood by placing it on each of these axes rather than forcing it into a single box.

Four axes of classification, and where India sits:

• Written / Unwritten — India: written and codified
• Rigid / Flexible — India: partly rigid, partly flexible (Article 368's three routes)
• Federal / Unitary — India: federal in structure with a unitary bias ("quasi-federal")
• Parliamentary / Presidential — India: parliamentary — executive accountable to the legislature

1. Written (Codified) and Unwritten (Uncodified) — A written constitution exists as a single formal document adopted at one point in time (India, the United States). An unwritten constitution is drawn from multiple sources — statutes, judicial precedent, and long-standing convention — with no single authoritative text (the United Kingdom is the standard example). India's Constitution is written and codified.

2. Rigid and Flexible — This classification turns on how difficult the constitution is to amend. A rigid constitution requires a special procedure — a higher majority, a longer process, sometimes ratification by constituent units — that is harder than passing ordinary law (the United States is highly rigid). A flexible constitution can be amended by the same simple procedure as ordinary legislation (the United Kingdom, again, is the standard example, since Parliament can alter constitutional rules exactly as it alters any other statute).

3. Federal and Unitary — A federal constitution divides sovereign power between a central government and constituent units (states/provinces), each supreme within its own sphere, usually with a written document that cannot be changed by either level acting alone (the United States, again). A unitary constitution concentrates all power in the central government, which may delegate authority to local units but can also take it back (the United Kingdom and France are classic unitary examples).

4. Parliamentary and Presidential — In a parliamentary system, the executive (Prime Minister and Council of Ministers) is drawn from and remains accountable to the legislature, and can be removed by a vote of no confidence (the United Kingdom, India). In a presidential system, the executive head is elected separately from the legislature, serves a fixed term regardless of legislative confidence, and the two organs are more sharply separated (the United States).

• Written vs. Unwritten turns on whether there is a single codified document
• Rigid vs. Flexible turns on how difficult the amendment procedure is
• Federal vs. Unitary turns on how power is divided between the centre and constituent units
• Parliamentary vs. Presidential turns on the relationship between the executive and the legislature
• India's Constitution is written, partly rigid and partly flexible, federal in structure with a unitary bias (often called "quasi-federal"), and parliamentary in form

• Constitutions are also classified as monarchical or republican, depending on whether the head of state holds office by heredity (the United Kingdom) or by election for a term (India, the United States) — India is a republic under Article 1 read with the Preamble
• K.C. Wheare himself doubted whether "rigid vs. flexible" was as useful as it sounds, since real-world ease of amendment often depends more on a country's political culture than on its formal procedure — worth remembering as an exam-answer nuance, not just the textbook pairing

Written vs. Unwritten Constitutions — At a Glance

A Practical Example

India's own Constitution shows why the rigid/flexible label is best applied part by part rather than to the whole document. Article 368 sets out three separate amendment routes: some provisions (like creating a new state) can be changed by Parliament through an ordinary law; most provisions need a special majority in each House of Parliament; and provisions touching the federal structure (like the powers of the Supreme Court or High Courts) need that special majority plus ratification by at least half the state legislatures. The same Constitution is therefore flexible for some provisions and rigid for others — which is exactly why constitutional lawyers describe India as "partly rigid, partly flexible" rather than picking one label.

Quick Revision Points

• Magna Carta (1215) — earliest limit on royal power by written charter, not itself a constitution
• US Constitution (1787) — world's first codified, written national constitution
• French Declaration of the Rights of Man (1789) — popular sovereignty, inherent rights
• Written vs. Unwritten — single codified document or not
• Rigid vs. Flexible — how hard the constitution is to amend
• Federal vs. Unitary — how power is divided between centre and units
• Parliamentary vs. Presidential — relationship between executive and legislature
• India: written, partly rigid/partly flexible, federal-with-unitary-bias, parliamentary, republican