Constitutional orders rarely announce that they are becoming less constitutional. More often, the institutions remain in place while their functions begin to blur.

A legislature still meets. Courts still issue opinions. An executive still claims to act under law. Yet the practical balance changes when one institution starts doing work that normally belongs to another, or when one branch becomes too weak to perform its own role.

That problem is not confined to one country or one political movement. Freedom House’s 2026 report describes a twentieth consecutive year of global decline in political rights and civil liberties. International IDEA has likewise documented declines in effective parliaments and judicial independence in a significant number of countries.

The point is not that every overlap between institutions is a sign of failure. Modern government depends on overlap. The harder question is whether citizens can still tell who made a consequential decision, who carried it out, and who can review it.

Three functions, not three boxes

One way to approach that question is to focus less on institutional labels and more on the functions political orders must perform.

The comparative mythologist Georges Dumézil described a recurring Indo-European pattern organized around sovereignty, force, and production. What makes Dumézil useful here is that his framework isolates a basic problem of government in that every political order must decide how authority will judge, act, and provide for the community. That comparison is suggestive, but it is not a genealogy of modern constitutionalism. The United States did not derive Articles I, II, and III from Indo-European mythology, and parliamentary democracies do not reproduce a prehistoric constitutional blueprint.

The narrower point is that political communities repeatedly distinguish among different kinds of public authority. Someone makes or authoritatively interprets rules. Someone carries those rules into action. Someone organizes representation, resources, and the material life of the community.

Plato’s rulers, guardians, and producers offer one ancient example. Polybius described institutional balance through the mixed constitution. Montesquieu later supplied a much more direct source for modern separation-of-powers theory by distinguishing legislative, executive, and judicial authority.

These schemes differ dramatically. What recurs is the intuition that political power is not one undifferentiated activity.

Why blurring matters now

Many contemporary constitutional disputes are disputes about functional substitution.

Executives face demands for speed, expertise, and coordination. Legislatures can be slow, polarized, or unwilling to make politically costly choices. Challenges to executive action then push courts into disputes with large policy consequences.

None of that, standing alone, means a constitutional system is failing. Modern states need administrative agencies. Executives need discretion. Courts must sometimes restrain unlawful action. Legislatures cannot specify every technical detail in advance.

The danger appears when substitution becomes the ordinary way government works.

If legislatures routinely avoid major policy choices, executives have stronger incentives to make them through administrative or emergency mechanisms. If executives push the limits of delegated authority, courts are drawn further into disputes that may have begun as failures of representative decision-making. If judicial settlement becomes the expected answer to every major political conflict, courts can become central actors in questions that a healthier political process might resolve elsewhere.

The result is not simply “too much power” in one branch. It is uncertainty about what kind of authority each institution is exercising and who is answerable for it.

A comparative problem

The issue becomes clearer comparatively because constitutional systems distribute these functions in different ways.

A parliamentary democracy does not separate executive and legislative personnel in the American fashion. Constitutional courts vary greatly in their powers. Independent central banks and regulatory agencies complicate any simple three-branch model.

Yet these systems still have to answer familiar questions. Who makes generally applicable rules? Who carries them into effect? Who decides whether officials have acted lawfully? Who controls public resources? Who can correct officials who exceed their authority?

Those questions survive institutional variation.

They also explain why constitutional erosion can occur without abolishing elections or suspending a constitution. Institutions can remain formally intact while legislatures lose oversight capacity, courts lose independence, or executive authority becomes harder to check. International IDEA treats effective parliaments and judicial independence as distinct measures for precisely this reason: elections do not exhaust the question of how power is exercised between elections.

A functional test for constitutional health

This older three-part pattern therefore offers a modest diagnostic tool.

Instead of asking only whether a country still has a parliament, president, or court, ask three functional questions.

Who is actually making the rules that structure political and social life?

Who has the practical capacity to carry those rules into action?

Who can authoritatively judge disputes about the legality and limits of that action?

Then ask a fourth question: can each function still check the others without simply taking their place?

This approach avoids two opposite mistakes. The first is formalism. Institutions can remain on paper while their practical roles change. The second is nostalgia. There has never been a perfectly separated constitutional order. Functions overlap by design, and some overlap makes government possible.

The objective is not purity. It is intelligible responsibility.

Why international relations scholars should care

This is not only a domestic constitutional question.

The internal allocation of authority shapes how states behave abroad. Decisions about war, sanctions, treaties, migration, trade, emergency powers, and international institutions often expose tensions among legislative authorization, executive action, and judicial review.

A state whose foreign policy depends heavily on executive discretion may act quickly, but some commitments may prove less durable across administrations. Legislative participation can slow decision-making, but it can also broaden political ownership. Courts can enforce legal limits and protect rights, while extensive judicialization can move foreign-policy disputes into institutions not designed to negotiate political compromises.

Other states do not interact with an abstract sovereign. They interact with executives whose promises may depend on legislatures, courts, agencies, elections, and constitutional rules. Domestic institutional structure therefore affects the credibility and durability of international commitments.

What the old pattern can and cannot tell us

Dumézil does not give us a constitutional design manual. Mythology cannot tell a legislature how much authority to delegate, when a court should defer to an executive, or how emergency powers should operate.

But the comparison can sharpen the question. Across very different political traditions, people repeatedly distinguished authority that judges, authority that acts, and authority tied to the representative and material life of the community. Modern constitutional orders transformed those distinctions into institutions with very different histories and legal forms.

The contemporary problem is not simply that one branch may win a temporary contest with another. It is that constitutional orders can lose sight of why political communities distinguished these functions in the first place.

When making rules, executing them, and judging disputes about them become too concentrated or too confused, the constitution may still exist on paper. What weakens is the structure of responsibility that makes constitutional government more than a document.