4 Constitutions and Political Institutions

Constitutional rules and comparison

A constitution establishes who may exercise public power, how institutions relate to one another, and how the rules of government may be changed. Constitutional rules shape how power is distributed and constrained. Some constitutions are contained in one written document; others draw on statutes, court decisions, conventions, and other laws.

Comparing political institutions requires more than comparing their names. Consider who selects officials, how long they serve, what powers they hold, how they can be held accountable, and whether another institution can limit their decisions. An institution’s operation depends on the constitution and the country’s political practice.

Executives and accountability

The executive directs government administration and puts laws and policy into effect. A constitution may distinguish between the head of state, who formally represents the country, and the head of government, who leads its political administration.

• In a presidential system, a popularly elected president typically serves as both head of state and head of government for a fixed term. The legislature does not ordinarily dismiss the president through a routine confidence vote, and the president generally cannot dissolve the legislature. The United States is a familiar example.

• In a parliamentary system, the prime minister and cabinet depend on the legislature’s support and can be removed by a loss of confidence. A monarch or president may serve separately as a largely ceremonial head of state. The United Kingdom is a familiar example.

• In a semi-presidential system, a directly elected president shares executive authority with a prime minister and cabinet that depend on legislative support. The precise division of power varies, so the label alone does not show which executive has greater influence.

These arrangements create different accountability relationships. Presidential systems separate executive and legislative mandates, while parliamentary systems link the government’s survival to legislative confidence. The balance also depends on party control of the legislature, constitutional powers, and political conventions.

Legislatures and oversight

A legislature represents the public, debates and passes laws, approves public spending, and scrutinizes the executive. Legislatures vary in size, election method, committee powers, and the strength of their oversight. Their ability to check government depends not only on formal powers but also on whether opposition members can question officials, investigate policy, and participate meaningfully in proceedings.

A unicameral legislature has one chamber; a bicameral legislature has two. A second chamber may represent regions or states, review proposed laws, or provide another point of legislative scrutiny. In federal systems, an upper chamber may give constituent units a role in national lawmaking, although the chamber’s composition and influence differ across countries.

Courts and constitutional review

Courts resolve legal disputes and interpret laws. Where courts have judicial review, they may assess whether government action or legislation complies with the constitution. Some systems assign constitutional review to a specialized constitutional court; others allow ordinary courts to consider constitutional questions. The scope and effects of review vary.

Judicial independence helps courts decide cases without improper pressure from political actors. Rules for judicial appointments, secure tenure, and procedures for removal can support independence. Independence does not mean judges are above the law: systems also provide mechanisms for accountability in cases of misconduct.

Territorial distribution of power

Constitutions divide authority between national and subnational governments in different ways.

• In a unitary state, the national government is the ultimate source of public authority across the country. It may still give elected regional or local governments substantial responsibilities; their powers are generally delegated or devolved within the unitary constitutional order. France is an example of a unitary state with decentralized government.

• In a federal system, the constitution divides authority between the national government and constituent units, such as states or provinces. Those units have constitutionally protected powers in at least some policy areas. The United States is a familiar example. Federalism combines self-government within constituent units with shared government at the national level.

• Decentralization is the transfer of responsibilities, decision-making authority, or resources to subnational governments. It describes a degree or process of shifting power, not a single constitutional category: both unitary and federal states can be decentralized. Decentralization can be political, administrative, and fiscal, and these dimensions do not always advance equally.

“Unitary” does not necessarily mean highly centralized, and “federal” does not automatically mean that regions control more policy or spending. To compare countries, examine which level makes decisions, which level pays for them, and whether subnational powers can be changed by ordinary national law or are protected by the constitution.

A framework for comparing countries

Compare countries across several dimensions rather than assigning each a single label. Ask:

• Constitution: What rules are constitutionally protected, and how difficult are they to amend?

• Executive: Who chooses the government? Can the legislature remove it? Does executive authority rest with one leader or several?

• Legislature: How are members selected? Is there one chamber or two? Can legislators investigate and scrutinize the executive?

• Courts: Can courts review government action for constitutionality? How are judges appointed and protected from improper pressure?

• Territorial authority: Which powers belong to national and subnational governments? Who controls revenue and public services?

The United States combines a presidential executive, a bicameral national legislature, and a federal division of power. The United Kingdom combines parliamentary government with a unitary state that has devolved powers. These examples show why institutional comparison should consider several dimensions together.

Overall, constitutions structure government by distributing authority, setting accountability rules, and defining how power may be challenged or changed. Executives differ in their relationship to legislatures; legislatures vary in representation and oversight; and courts differ in their powers of constitutional review and safeguards for independence. Territorial arrangements range from unitary government to federal power-sharing, while decentralization can occur within either.