Constitutionalism: Limiting Power Through Law and Institutions

Imagine you are playing a football match. Everything seems normal at first. But then you notice something strange. One of the players is also the referee. Whenever he wants, he changes the rules. He decides when a goal counts and when it does not. He can send off any opponent he dislikes. He cannot lose, because he controls the game itself. This feels deeply wrong to you, and your instinct is correct. A game where one player controls the rules is not really a game at all. It is simply a performance of power. Now imagine that same situation, but instead of a football match, the "game" is running a country. Instead of a football, the prize is control over laws, taxes, armies, and the lives of millions of people. This is why the idea of constitutionalism — the subject of today's lesson — is one of the most important ideas in all of human history. It is the answer to the question: how do we stop the referee from also being a player? Let us begin at the very beginning. Every society needs a government. Even people who deeply distrust governments agree on this much. Without some organised authority, there would be no one to build roads, settle disputes between neighbours, protect citizens from criminals, or defend the country from outside attack. The ancient Greek philosopher Aristotle, who lived around 350 years before the birth of Christ, was one of the first thinkers to study government carefully. He looked at many different city-states and tried to understand what made some work well and others collapse into violence and chaos. One of his most important conclusions was simple but profound. He wrote that "it is more proper that law should govern than any one of the citizens." In other words, no single human being should have unlimited control. Not a king. Not a general. Not even a beloved hero. The law itself should be the highest power. But this raises an obvious question. Who writes the law? And what stops the people who write the law from writing it entirely in their own favour? This is precisely the problem that constitutionalism tries to solve. Constitutionalism is the idea that government power must not be unlimited. It must be defined, divided, and controlled by a set of foundational rules — rules that even the government itself must obey. Think of it like the rules of the football match that exist before any team steps onto the pitch. No player invented them. No player can simply cancel them during the game. They exist above everyone, and everyone must play within them. Now, here is a distinction that is absolutely critical to understand, because many people confuse these two things. There is a difference between having a constitution and practising constitutionalism. A constitution is simply a document, or a set of documents, that describes how a government is organised. Almost every country in the world has one. North Korea has a constitution. The Soviet Union had a constitution. Many of the world's most oppressive dictatorships have had beautifully written constitutions full of grand promises about freedom and rights. But a piece of paper means nothing by itself. Constitutionalism is not the document. It is the living practice of actually limiting and controlling government power. It is what happens when the constitution is genuinely followed, when courts can enforce it against presidents and parliaments, when citizens can demand their rights, and when no one — absolutely no one — is above the law. So how does constitutionalism actually work in practice? It rests on several key pillars. Let us look at each one carefully, with real examples to make them concrete. The first and most fundamental pillar is called the rule of law. This means that everyone in a society — every ordinary person, every police officer, every politician, every general, and even the president or prime minister — is subject to the same laws. No one is above the law. The law applies equally to all. The opposite of the rule of law is sometimes called the rule of man, where the decisions of a powerful individual override legal principles whenever it suits them. Think of a medieval king who could simply order someone's head chopped off on a personal whim, with no trial and no legal process. That is the rule of man. The rule of law says: even the king must follow the procedures. Even the most powerful person must go through the courts. Even the government must justify its actions in legal terms. This sounds obvious when we say it out loud, but achieving it in practice has taken humanity thousands of years of struggle, and in many parts of the world, the struggle is still going on. The second pillar is the separation of powers. This is an elegant idea whose full importance we can appreciate with a simple example. Imagine one person or one group that both makes the laws and enforces the laws and decides whether the laws have been broken. This person or group has total control over society. They can make a law that says "only our friends may own businesses," then use the police to enforce it, and then use the courts to punish anyone who challenges it. There is no check, no limit, no way for ordinary people to appeal. To prevent this nightmare scenario, constitutional systems divide the functions of government into three separate branches. The first is the legislature, which is the body that makes laws, such as a parliament or congress. The second is the executive, which is the body that puts laws into practice and runs the day-to-day business of government, such as a president, prime minister, or cabinet of ministers. The third is the judiciary, which is the court system that interprets the laws and decides disputes about whether laws have been broken or whether they are even valid. The intellectual father of this idea in its modern form is a French philosopher named Montesquieu, who wrote a major work called The Spirit of the Laws in 1748. Montesquieu studied different governments around the world and came to a powerful conclusion. He wrote that when the power to make laws and the power to enforce them are held by the same person or group, there can be no freedom. Liberty — meaning genuine freedom for ordinary people — requires that these powers be kept separate. His ideas were read eagerly by a generation of revolutionary thinkers in America and France, and they directly shaped the design of modern governments. But separation of powers alone is not enough. Simply having three branches does not guarantee that any of them will respect the boundaries of the others. This is where the third pillar comes in: checks and balances. This is the idea that each branch of government should have specific tools to watch over and limit the other two. Each branch can, in a sense, push back against the others. Consider the United States as an example, since it is one of the clearest illustrations of this system at work. The American Congress, which is the legislature, passes laws. But the President, who leads the executive branch, can refuse to sign a new law, sending it back to Congress. This is called a veto, meaning a refusal. Congress can then fight back by voting again, and if enough members agree — a very large majority, known as a supermajority — they can override the president's veto and make the law anyway. Meanwhile, the Supreme Court, which leads the judicial branch, can look at any law that has been passed and rule that it violates the constitution. If the court makes that ruling, the law is struck down entirely, no matter who supported it or how popular it was. And if a president or a judge behaves criminally or abuses their power, Congress can put them on trial and remove them from office. This process is called impeachment. Each branch is thus both powerful and limited. None can act entirely alone. None can dominate the others entirely. The fourth pillar is the protection of individual rights. Constitutionalism is not only about how governments are organised. It is also about what governments cannot do to ordinary people. This is a subtle but vital point. A constitutional system defines a private space around every individual — a sphere of life where the government simply has no right to enter. These protected areas are usually called civil liberties or fundamental rights. They typically include things like the freedom to say what you think, the freedom to follow whatever religion you choose, the freedom to gather peacefully with other people, and the right to a fair trial before a court if you are accused of a crime. Many constitutions list these rights in a special section often called a Bill of Rights. The American Bill of Rights, added to the constitution in 1791, is one of the most famous examples. The idea is that these rights belong to people simply because they are human beings, not because a government chose to give them. And because a government did not give them, no government can legitimately take them away. The fifth and perhaps most powerful pillar is something called judicial review. This is the ability of courts — especially the highest court in a country — to look at laws and government actions and decide whether they are allowed under the constitution. If a court finds that a law breaks the rules set out in the constitution, that law can be declared invalid. Judicial review transforms a constitution from a set of polite suggestions into an enforceable legal reality. Without judicial review, a constitution is just a document that politicians can ignore whenever it is inconvenient. With judicial review, the constitution has teeth. The story of how judicial review was established in the United States is one of the most fascinating in legal history. The American constitution, written in 1787, does not actually say anywhere that the Supreme Court has the power to strike down laws. This power was claimed by the court itself, through an act of brilliant legal reasoning by a judge named John Marshall in the year 1803. The case was called Marbury v. Madison, and the details involve a dispute about government appointments that sounds rather dry on the surface. But Marshall used this minor case to establish something enormous. He argued that the constitution is the supreme law of the land. If any ordinary law contradicts the constitution, the constitution must win. And since it is the job of courts to interpret the law, it must be the court's job to decide when a law breaks the constitution. With this simple but powerful logic, Marshall gave the judiciary a tool that would make it one of the most influential institutions in American history. Courts in many other countries around the world later adopted the same idea. To understand how these principles play out in real life, let us look at three very different countries and what constitutionalism means in each of them. Our first example is South Africa. If you wanted to choose a country where constitutionalism truly proved its worth in a dramatic and moving way, South Africa would be at the top of the list. For decades, South Africa was ruled by a brutal system called apartheid, a word from the Afrikaans language meaning "separateness." Under apartheid, the small white minority of the population controlled the government and used that power to oppress, humiliate, and impoverish the black majority. There were laws that told black South Africans where they could live, what jobs they could hold, which schools their children could attend, and which beaches they were allowed to swim on. The government that ran this system had a constitution, but it meant nothing in practice. Power was concentrated, abused, and protected by violence. When apartheid finally ended in the early 1990s, South Africans of all backgrounds came together to build something new. They wrote a new constitution, adopted in 1996, that is widely considered one of the most progressive and carefully crafted in the world. It contains strong protections for an enormous range of rights, including rights based on race, gender, religion, and sexual orientation. It created a powerful Constitutional Court specifically designed to enforce these protections. And the court proved that it was not merely decorative. Years later, when a man named Jacob Zuma was president, it was discovered that he had spent large amounts of public money — money belonging to all South African citizens — to upgrade his private home. The Constitutional Court ruled that this violated the constitution and ordered Zuma to repay the money. A sitting president, the most powerful person in the country, was told by a court that he had broken the rules, and he was ordered to pay. That is constitutionalism in action. Our second example is the United Kingdom, which offers a fascinating and very different picture. Most countries with strong constitutional traditions have a single written document — a formal constitution that everyone can read and point to. The United Kingdom has no such document. Its constitutional rules are spread across centuries of laws, court decisions, historical documents, and unwritten traditions and customs. The Magna Carta, signed in 1215, is part of it. Various Acts of Parliament are part of it. Long-standing customs about how the government behaves are part of it. This makes many people ask: does the United Kingdom actually have constitutionalism at all, if there is no single document to enforce? The Magna Carta is worth pausing on for a moment, because it is one of the most important documents in this entire story. In the year 1215, King John of England was in serious trouble. His nobles — the powerful landowners who supported his army — were furious with him. He had been taxing them heavily, ignoring their traditional rights, and acting as though their lives and property were entirely at his disposal. They rose up against him and forced him to sign a document known as the Magna Carta, which means "Great Charter" in Latin. The charter contained many specific rules about the rights of nobles. But buried within it was a principle with enormous consequences. It said that the king could not simply imprison a free man without lawful judgment. The king was bound by the law of the land. Even the king was not above the rules. Now, the Magna Carta was not a perfect document. It was mainly concerned with protecting the rights of wealthy noblemen, not ordinary people. But the principle it established — that even the supreme ruler must follow the law — became one of the founding ideas of constitutionalism across the English-speaking world and far beyond. Centuries later, American colonists fighting against British rule would cite the Magna Carta as evidence that even kings had limits. Returning to the United Kingdom today, the answer to our question is that constitutionalism there depends very heavily on political culture, tradition, and strong independent institutions rather than a formal written document. It has generally worked well, but it requires a level of trust and respect for tradition that not every society possesses. More recently, the UK has strengthened its formal constitutional protections by creating a Supreme Court in 2009, clearly separating the highest judicial power from the legislature, and by passing the Human Rights Act in 1998, which requires courts to take account of fundamental rights in their decisions. Our third example takes us back to the United States, and specifically to the ongoing debate about how to interpret a constitution that is over two hundred years old. The American constitution was written at a time when there were no aeroplanes, no internet, no nuclear weapons, no televisions, and when millions of people within the country's borders were held as slaves. How should judges in the twenty-first century interpret words written in the eighteenth century for a world that no longer exists? There are two main schools of thought on this, and they produce fierce disagreements. The first school is called originalism. Originalists believe that judges should try to understand what the people who wrote the constitution originally meant when they chose their words, and stick as closely as possible to that original meaning. The argument is that if judges are free to reinterpret the constitution in any way they like, they are no longer following the constitution at all — they are simply writing new law themselves, without being elected or accountable to anyone. The second school believes in what is sometimes called a living constitution. Supporters of this view argue that a constitution is a set of enduring principles, not a frozen photograph of one historical moment. They say that the principles of freedom and equality that the constitution's writers believed in should be applied thoughtfully to new circumstances. For example, should the constitution's protections against "unreasonable searches" apply to government agencies reading your private emails? Originalists and living-constitution theorists often reach different answers on questions like this, and those disagreements shape the direction of entire societies. This debate connects to a broader tension at the heart of constitutionalism, one that democracy theorists have argued about for generations. Courts — especially constitutional courts with the power of judicial review — are typically made up of appointed judges, not elected politicians. They answer to no voters. They serve long terms, sometimes for life. Yet they have the power to strike down laws passed by elected parliaments and signed by elected presidents. In a democracy, where the people are supposed to rule through their chosen representatives, is it right for unelected judges to have this much power? The defenders of judicial independence offer a powerful answer. Democracy is not simply the rule of the majority. If a majority of voters wanted to strip a minority group of its rights, a purely majoritarian system would allow that to happen. History is full of terrible examples of majorities voting to oppress minorities. Constitutional courts, precisely because they are shielded from electoral pressure, can protect unpopular minorities and enforce rights that temporary majorities might wish to ignore. The independence of judges is not a flaw in the democratic system. It is one of its most important protections. But constitutionalism faces challenges that go beyond debates among legal scholars. In many countries today, we are watching a phenomenon that some political scientists — people who study politics academically — call democratic backsliding. This is when a country that appeared to be a functioning democracy gradually, step by step, weakens the institutions that limit government power. The government does not abolish the constitution openly. Instead, it fills courts with loyal supporters, changes electoral rules to give itself advantages, weakens independent media, and uses the formal language of law to hollow out the substance of accountability. Hungary under Prime Minister Viktor Orbán and Turkey under President Recep Tayyip Erdoğan are examples that scholars frequently discuss. Both leaders were elected in genuine elections. Both have used constitutional and legal processes to concentrate power in ways that many observers argue undermine the spirit of constitutionalism even while maintaining its outward forms. This raises an uncomfortable question: can constitutionalism survive a government that is determined to dismantle it from within, using the constitution's own procedures as its tools? There is also a growing debate about what we might call supranational constitutionalism — a word that simply means constitutional rules that operate above the level of individual nation-states. The European Union is the most developed example of this. Member states of the EU have agreed to follow a body of European law that, in certain areas, overrides their own national laws. European courts can make rulings that affect citizens in many different countries simultaneously. Some scholars see this as a hopeful extension of constitutional ideas to the international level, creating yet another layer of checks on the power of individual governments. Others are deeply suspicious, arguing that these supranational bodies are even less accountable to ordinary people than national governments, and that their power is therefore even harder to challenge. None of these debates have simple answers, and scholars continue to argue about them vigorously. That is perhaps the most honest thing we can say about constitutionalism as a whole: it is not a solved problem or a completed project. It is an ongoing effort. Every generation must work to maintain the institutions and habits that limit power. Every generation faces new challenges that the previous one never imagined. Constitutionalism is less like a building that, once constructed, stands forever on its own, and more like a garden that requires constant tending, care, and protection from weeds. What Aristotle understood over two thousand years ago, what the rebellious barons grasped when they forced King John to sign the Magna Carta, what Montesquieu reasoned through in his study, and what the founders of the American republic debated fiercely in Philadelphia in 1787 — all of them were circling the same fundamental problem. Human beings who hold power over other human beings are tempted to abuse it. Not all of them will. Many leaders throughout history have been honourable and restrained. But a system that depends entirely on the goodness of individual leaders is fragile. It is only as strong as the character of whoever happens to be in charge at any given moment. Constitutionalism is the attempt to build a system that is stronger than any individual within it. A system where the referee and the player are not the same person. A system where the rules exist before the game begins and survive after any individual player has left the field. Let us take a moment to bring together the key ideas from this lesson. Constitutionalism is the principle that government power must be limited, defined, and controlled by a higher set of foundational rules that apply to everyone, including the government itself. It is different from simply having a written constitution, because a constitution is only meaningful if it is actually practised and enforced. The key pillars of constitutionalism are the rule of law, meaning no one is above the law; the separation of powers between legislature, executive, and judiciary; a system of checks and balances so that each branch can limit the others; the protection of individual rights that governments cannot violate; and judicial review, the power of courts to strike down laws that contradict the constitution. These ideas developed over centuries, from ancient Greece through the Magna Carta of 1215, through the writings of Enlightenment thinkers like Locke and Montesquieu, and into the written constitutions created after the American and French revolutions. Different countries practise constitutionalism in different ways, as we saw through the examples of South Africa, the United Kingdom, and the United States. And constitutionalism faces serious ongoing challenges, including the debate over how to interpret old texts in new times, the tension between judicial independence and democratic accountability, the danger of leaders who dismantle constitutional norms from within, and the new questions raised by international governing bodies. Through all of these challenges, the core purpose remains the same: to ensure that no one who holds power can hold it without limit, without accountability, and without law.