Federalism vs. Unitary States: How Power Is Divided Within Nations

The Architecture of Divided Power

When Swiss voters in 2021 rejected a nationwide ban on face coverings — the so-called burqa ban initiative — the outcome illustrated a federal principle: a national majority imposed its preference on cantons where the ban had no practical application and where local sentiment diverged sharply from the national vote. Switzerland's 26 cantons retain substantial autonomy in most policy domains; the federal government's role is more constrained than in most democracies. At the other extreme, France's highly centralized unitary state has historically determined education curriculum, police organization, and municipal governance from Paris. Between these poles lies virtually every other constitutional design — a spectrum of power distribution arrangements that reflect history, ethnic composition, geographic scale, and political theory.

The Federal-Unitary-Confederation Spectrum

The distinction between federal and unitary states is not always sharp in practice. Highly devolved unitary states like the United Kingdom can be more decentralized in effect than formally federal states like Mexico, where federal resources and political patronage have historically concentrated power in the national government despite the formal federal structure.

U.S. Dual Sovereignty

American federalism is characterized by dual sovereignty: states are not mere administrative units of the federal government but sovereign entities in their own right, with independent constitutional authority. The Tenth Amendment explicitly reserves to states and the people all powers not delegated to the federal government by the Constitution. Federal and state governments operate simultaneously in the same territory, exercising different but potentially overlapping jurisdictions.

The boundary between federal and state authority has been contested throughout American history. The Civil War settled by force the question of whether states could unilaterally leave the union; subsequent jurisprudence has progressively interpreted federal commerce power broadly, expanding federal authority into areas once considered exclusively state. The Supreme Court's New Deal-era decisions in the late 1930s dramatically expanded the commerce clause's reach; subsequent decisions have occasionally reasserted state authority (Lopez 1995, Morrison 2000, NFIB v. Sebelius 2012). The constitutional boundary remains genuinely contested, reflecting ongoing normative disagreement about the appropriate scope of national versus state authority.

German Cooperative Federalism

Germany's federal system differs structurally from the American model in ways that produce different political dynamics. Rather than dual sovereignty with separate spheres, German federalism is "cooperative" or "interlocking": the federal government (Bund) makes most major legislation, but the Länder (states) implement it using their own administrative systems. The Bundesrat — the upper house of parliament — consists of delegations from Land governments and must approve federal legislation that affects Land administration. This gives Land executives direct influence over federal law-making.

The Bundesrat mechanism means that federal coalitions must frequently negotiate with Land governments of different political compositions, producing centripetal coalition pressure and policy moderation. Major welfare state reforms require Bundesrat approval, meaning opposition-controlled states must be brought on board or constitutional reform pursued. The 2006 federalism reform attempted to disentangle federal and Land competencies by clarifying which levels governed which policy areas exclusively, reducing but not eliminating the cooperative interlocking that characterizes German federalism.

Fiscal Federalism: Grants, Revenue Sharing, and Competition

Fiscal federalism studies how public revenues and expenditures are distributed across governmental levels. Three mechanisms allocate fiscal resources in federal and decentralized systems:

• Own-source revenues: Subnational governments levy their own taxes (property tax, state income tax, sales tax) and retain the proceeds. Creates strong accountability — citizens directly experience the link between local taxes and local services.
• Intergovernmental grants: Central governments transfer funds to subnational governments, either as general purpose grants (block grants in U.S. terminology) giving recipients discretion, or as categorical grants specifying permitted uses. Federal Medicaid spending is a large conditional grant — states receive federal funds only if they follow federal rules.
• Revenue sharing / equalization: Transfers from wealthier to poorer subnational governments to reduce fiscal capacity disparities. Germany's Länderfinanzausgleich (fiscal equalization) redistributes tax revenue from wealthy states (Bavaria, Hamburg) to less wealthy ones — a system that has generated sustained political conflict between net contributors and net recipients.

UK Devolution: Asymmetric by Design

The United Kingdom's devolution settlement, established in 1997–1999, granted legislative assemblies with varying powers to Scotland, Wales, and Northern Ireland while leaving England governed directly by the Westminster parliament. The asymmetry is striking: Scotland has a parliament with primary legislative powers and limited tax-varying authority; Wales began with secondary legislative powers only (substantially expanded in 2017); Northern Ireland's Assembly operates under power-sharing rules requiring cross-community consensus; England has no equivalent assembly.

Scottish devolution was the most consequential. The Scottish National Party's rise to dominance in Holyrood (the Scottish Parliament) produced the 2014 independence referendum, in which Scotland voted 55/45 to remain in the UK. Brexit — which Scotland voted 62% against — has sustained independence momentum, with polls consistently showing greater independence support than the 2014 result. Devolution designed to settle the Scottish question appears to have accelerated it.

Spanish Autonomous Communities and Asymmetric Federalism

Spain's 1978 constitution created a system of "Autonomous Communities" — 17 regions with varying levels of self-governance negotiated individually rather than standardized nationally. The Basque Country and Navarre retain special fiscal arrangements (concierto económico) allowing them to collect most taxes locally and transfer an agreed amount to Madrid. Catalonia negotiated an expanded autonomy statute in 2006, subsequently struck down in part by Spain's Constitutional Court in 2010 — a decision that catalyzed the Catalan independence movement that produced the 2017 declaration of independence and subsequent constitutional crisis.

Spain's asymmetric federalism illustrates both the advantage (accommodating regional diversity) and the limitation (asymmetric arrangements generate demands for further differentiation and can entrench regional grievances rather than resolving them) of the model.

Advantages and Disadvantages

Federalism's theoretical advantages are well-developed in the academic literature. Justice Louis Brandeis's "laboratories of democracy" metaphor (1932) captures the policy experimentation argument: states can try different approaches to policy problems, and successful innovations can spread nationally. Massachusetts's healthcare reform (2006) preceded and influenced the Affordable Care Act (2010). Preference matching argues that decentralized governance allows different regions to adopt policies matching their populations' distinct preferences — conservative states on social issues, progressive states on environmental policy — rather than imposing a single national standard.

The disadvantages are equally recognized. Race-to-the-bottom dynamics occur when subnational governments compete for mobile capital by lowering regulatory standards or taxes, producing a collective action problem where all jurisdictions are worse off than they would be under coordinated standards. Coordination failures arise when policies with spillover effects — environmental regulation, transportation, public health — require central coordination that federalism makes politically difficult. Fiscal federalism's equity implications are problematic: citizens in poor states receive worse public services than those in wealthy states, undermining the ideal of equal citizenship.