Theories of Regionalism: Functionalism, Realism, and Beyond

Why do neighbouring countries decide to pool their resources, sign trade pacts, and build common institutions? And why do some regional groupings, like the European Union, deepen into supranational entities while others, like SAARC, struggle to move beyond paperwork? Political scientists have spent decades trying to answer these questions, and the result is a rich set of theories of regionalism. Each one shines a light on a different driver of regional cooperation, from grassroots interest groups to raw calculations of state power. Understanding these frameworks helps make sense of why regional blocs form, succeed, or stall.

What regionalism means 🔗

Before diving into the theories, it helps to fix the terms. Regionalism refers to the conscious, state-led project of building cooperation and institutions among countries within a geographical area. Regional integration is the deeper process where states pool sovereignty and create shared decision-making structures. The theories below try to explain the engine behind this process: who the main actors are, what motivates them, and how cooperation in one area spreads to others.

Most of these frameworks were developed by scholars studying European integration, since the EU is the most advanced example in the world. But they travel well, and analysts regularly apply them to ASEAN, the African Union, and South Asia’s own SAARC. Keep that in mind as you read: a theory built to explain Brussels can still illuminate why Delhi and Islamabad find cooperation so difficult.

Functionalism: cooperation through everyday needs 🔗

Functionalism is one of the earliest theories, developed largely by the scholar David Mitrany during the interwar period. Its central claim is simple. States cooperate not because of grand political ideals, but because ordinary human needs-public health, postal services, transport, trade-are best handled across borders by specialised agencies.

Mitrany argued that the nation-state was becoming obsolete as a way of solving these practical problems. His solution was to let technical experts run functional agencies that deliver real benefits to people. The idea was that these benefits would attract the loyalty of populations and gradually expand the area of cooperation. Crucially, functionalism downplayed territory and politics. It imagined a web of global agencies organised around tasks, not around fixed regions.

The theory rests on some strong assumptions: that the process unfolds within a framework of human freedom, that the necessary expertise exists, and that states will not deliberately sabotage cooperation. These assumptions are exactly what later critics questioned.

Neo-functionalism: the logic of spillover 🔗

By the 1950s, scholars wanted a theory that fit the emerging European Communities more closely. The result was neo-functionalism, associated above all with the American political scientist Ernst B. Haas. Neo-functionalism kept Mitrany’s focus on practical cooperation but added two big ideas: it brought territory back in by focusing on regional integration specifically, and it introduced the famous concept of spillover.

How spillover works 🔗

The spillover logic argues that integration in one economic sector creates pressure to integrate neighbouring sectors. If countries unify their coal and steel markets, they soon discover they need common rules on transport, competition, and labour to make it work. This is functional spillover. There is also political spillover, where interest groups and national elites shift their expectations and loyalties towards a new supranational centre once they see it delivering results. Neo-functionalists suggest that sectoral integration ultimately boosts a spillover effect, which in turn calls for still more integration.

The role of interest groups and institutions 🔗

Neo-functionalism gives a starring role to non-state actors. Business lobbies, trade unions, and political parties realise that supranational institutions can serve their interests better than national governments, so they redirect their pressure upwards. Over time, supranational bodies-like the European Commission-gain authority and even act as entrepreneurs, pushing the integration project forward. The theory also stresses background conditions such as economic interdependence and a degree of social pluralism, which make spillover more likely.

Neo-functionalism is best understood as a process theory. It does not just describe a snapshot; it tries to explain the causal links that carry states from one level of integration to the next. That said, the theory hit trouble when European integration stalled in the 1960s and again during later crises, forcing scholars to revise it. Even Haas later connected his ideas to constructivist thinking, accepting that integration is neither automatic nor linear but depends on evolving values and preferences.

Realism: power and the limits of cooperation 🔗

Where functionalists see cooperation as natural, realists are deeply sceptical. The realist tradition argues that international politics is anarchic, that states are the only actors that truly matter, and that they are obsessed with security and relative power. From this angle, regional groupings are not noble experiments in shared welfare. They are tools that states use to advance their own positions.

Realists point out that regional cooperation depends heavily on the power balance among members. A dominant state may use a regional bloc to extend its influence, while smaller states fear domination by the regional great power. Some realist critics even argue that regional groupings can be enlarged alliances that risk producing bigger conflicts rather than preventing them.

Realism also explains why states prefer relative gains over absolute gains. Even if cooperation would make everyone better off, a state may refuse if a rival gains more, because that shifts the power balance against it. This is a powerful lens for understanding South Asia. SAARC has remained weak partly because India is far larger than its neighbours, and mutual suspicion-especially between India and Pakistan-has repeatedly blocked deeper cooperation. As critics note, realism struggles to explain why so many regional organisations exist at all, since it expects states to guard their autonomy jealously.

Liberal intergovernmentalism: states still hold the keys 🔗

By the 1990s, a powerful alternative to neo-functionalism emerged. Developed by Andrew Moravcsik in 1993, liberal intergovernmentalism (LI) put the nation-state firmly back at the centre of the story. It is often called the “baseline” theory of regional integration, the standard against which others are measured.

LI combines liberal and realist insights into a three-stage model. First, national preferences are formed domestically, shaped by the economic interests of powerful constituents like industries and interest groups. Second, governments bargain with one another at the international level, where the outcome depends on the relative power of states stemming from asymmetrical interdependence. Third, states choose to build institutions to lock in their agreements and make commitments credible.

Moravcsik summarised European integration from 1957 to 1992 as a series of rational choices made by national leaders responding to economic interests, relative state power, and the value of credible institutions. The key takeaway is that supranational bodies do not drive integration on their own. They are servants created by governments, not masters. This directly challenges the neo-functionalist claim that institutions and interest groups push integration forward by themselves.

LI has its critics. Some argue it only explains the big treaty bargains and has little to say about the thousands of everyday decisions that keep a regional bloc running. Others say it overlooks how past decisions create their own momentum. Still, its emphasis on domestic preferences and interstate bargaining remains hugely influential.

Constructivism: ideas, norms, and identity 🔗

The theories above mostly assume that states pursue fixed material interests. Constructivism, drawing on scholars like Alexander Wendt, turns this assumption on its head. It argues that interests and identities are not given; they are socially constructed through interaction. For regionalism, this means that ideas, norms, and a shared sense of belonging can be just as important as trade figures or military power.

Constructivists focus on what is sometimes called cognitive regionalism-the shared awareness and regional identity that hold a community together. From this view, regional cohesion depends on a durable sense of community, not just on signed treaties. Countries may cooperate because they share principles such as democracy, human rights, and the rule of law, and regional organisations actively promote these values among members.

This perspective offers a sharp explanation for SAARC’s weakness. Some constructivist analyses argue that SAARC achieves little because its member states lack a strong collective identity and sufficient institutional commitment to act together. Where the EU built a genuine sense of “European-ness,” South Asia’s overlapping rivalries and contested national identities have prevented a comparable regional consciousness from taking root. Constructivism is still a less developed framework for regionalism than the others, but it captures something the material theories miss.

Multi-level governance: power dispersed across many levels 🔗

The newest framework on our list emerged directly from studying the EU’s growing complexity. Liesbet Hooghe and Gary Marks argued in their landmark work that neither neo-functionalism nor intergovernmentalism could fully capture what was happening in Brussels by the 1990s. They proposed multi-level governance (MLG).

The core insight is that authority and decision-making are no longer monopolised by national governments. Instead, power is shared and dispersed across multiple levels-supranational, national, regional, and local-and among many actors, including subnational regions and interest groups. Hooghe and Marks noticed that European integration involved a dual movement: authority shifted upward to the EU and downward to subnational regions at the same time.

A central feature of MLG is that it shifts focus from formal decisions taken by governments to the actual sharing of authority across levels throughout the entire policy process, from making rules to implementing them. This dispersal of authority is what distinguishes MLG from state-centric theories like liberal intergovernmentalism. While MLG was built for the densely institutionalised EU, its underlying idea-that governance happens through overlapping layers rather than a single sovereign centre-is increasingly relevant for understanding how modern regional and federal systems work.

Bringing the theories together 🔗

No single theory wins. Each captures part of the puzzle. Functionalism and neo-functionalism explain the bottom-up momentum of cooperation driven by practical needs and spillover. Realism reminds us that power and security fears can halt integration in its tracks, which is painfully clear in South Asia. Liberal intergovernmentalism shows that, in the end, national governments and their domestic interests strike the bargains that matter. Constructivism reveals the deeper role of shared identity and norms, explaining why some regions feel like communities and others do not. Multi-level governance describes the layered reality once integration becomes dense and complex.

The smartest analysts treat these frameworks as a toolkit rather than rival religions. Applied together, they explain both the spectacular success of European integration and the frustrating limits of regional cooperation closer to home.

What do you think? If you applied these theories to SAARC, which one best explains why South Asian cooperation has remained so limited-is it a problem of power, of identity, or of national governments unwilling to bargain away their autonomy? And as regional connectivity grows, do you think shared identity can be deliberately built, or does it have to emerge on its own?

References

1. https://en.wikipedia.org/wiki/Functionalism_(international_relations)
2. https://en.wikipedia.org/wiki/Neofunctionalism
3. https://www.insightturkey.com/articles/neo-functionalist-regional-integration-theory-put-to-test-in-asia-new-regionalism-around-india-and-asean1
4. https://politicsforindia.com/10-regionalization-of-world-politics-psir/
5. https://en.wikipedia.org/wiki/Andrew_Moravcsik
6. https://en.wikipedia.org/wiki/Liberal_intergovernmentalism
7. https://oxfordre.com/politics/politics/view/10.1093/acrefore/9780190228637.001.0001/acrefore-9780190228637-e-1065
8. https://www.iosrjournals.org/iosr-jhss/papers/Vol.%2025%20Issue2/Series-9/G2502094554.pdf
9. https://journals.sagepub.com/doi/10.1177/1369148120937982