The Challenge of Irrational Boundaries to State Systems

Look at almost any world map and the borders seem permanent, even natural. But many of these lines were drawn by people who never visited the land they were dividing, ignoring the communities living there. Political scientists call these irrational boundaries, and they remain one of the deepest sources of ethnic conflict in the modern world. Understanding why a line on a map can spark decades of violence is essential to understanding how the contemporary state system actually works.

What makes a boundary “irrational”? 🔗

In political science, the term irrational boundaries describes borders that do not align with the ethnic, cultural, linguistic, or geographical realities of the people living within them. A rational boundary might follow a major river or a mountain range, or it might separate two genuinely distinct communities. An irrational boundary does the opposite: it slices through a single community, lumps hostile groups into one state, or scatters one people across several countries.

The key point is that boundaries are not just lines. They define who belongs to a state, who counts as a citizen, and who becomes a minority. When the line is drawn without regard for the people on the ground, it builds instability into the very foundation of the state.

The colonial origins of the problem 🔗

Most of today’s irrational boundaries trace back to the colonial era, when European powers carved up Africa, Asia, and West Asia for their own convenience. The most striking example is the Berlin Conference of 1884-85, where European nations divided Africa among themselves while sitting thousands of kilometres away. These borders were, in the words of one analysis, imposed without the consent or contribution of African populations, with no consideration for how societies were already organised.

The logic was administrative and economic, not human. Colonial officials drew lines to mark out zones of influence, to avoid wars with rival empires, or to control trade routes. The Sykes-Picot Agreement of 1916, which split West Asia into British and French spheres, did exactly this. As historian analyses of the region note, colonial decisions like Sykes-Picot and the Durand Line continue to outlive colonial rule itself, shaping conflicts a century later.

How irrational boundaries create conflict 🔗

When a border ignores ethnic reality, it produces a predictable set of problems. Three of these stand out.

Divided peoples and the birth of stateless nations 🔗

The most direct consequence is that a single ethnic group can be split across multiple states, sometimes leaving them without any state of their own. The Kurds are the classic case. After the collapse of the Ottoman Empire following World War I, the Treaty of Sèvres briefly proposed a Kurdish state, but it was never implemented. The later Treaty of Lausanne in 1923 made no mention of a Kurdish homeland, and the Kurds were dispersed across the newly drawn borders of Turkey, Iran, Iraq, and Syria.

Today the Kurds number somewhere between 30 and 40 million people, making them the world’s largest ethnic group without a nation-state of their own. They are a minority in every country they inhabit, and in each one they have faced varying degrees of repression and denial of their identity. This statelessness is not an accident of nature. It is the direct result of how the map was drawn.

Minorities trapped inside hostile states 🔗

Irrational boundaries also create permanent minorities who feel little loyalty to the state they were placed in. When a border cuts a community in half, the people on each side suddenly become a minority within a larger national project that may actively suppress their language and culture. In Turkey, for example, speaking, writing, or broadcasting in Kurdish was prohibited until the 1990s, and Kurdish names were forcibly changed to Turkish ones.

This dynamic produces what scholars call a center-periphery problem. The central government, dominated by the majority group, treats border communities with suspicion and excludes them from development. The excluded group, in turn, feels no stake in the state. The result is a cycle of marginalisation and resentment that can simmer for generations.

Irredentism and ethnic nationalism 🔗

The third consequence is the rise of two powerful and destabilising forces: irredentism and ethnic nationalism. Irredentism is the claim by one state to territory in a neighbouring state on the grounds that the people there share its ethnic or cultural identity. Ethnic nationalism is the belief that a particular ethnic group should have its own state, even if that means redrawing existing borders.

Both forces are direct reactions to irrational boundaries. When a people are divided, the natural political response is either to demand reunification (irredentism) or to demand a state of their own (ethnic nationalism). These claims strike at the heart of the existing state system, because they challenge the legitimacy of the borders themselves.

Case studies: the divided peoples of South and West Asia 🔗

The outline for this topic highlights three peoples who were split by irrational boundaries. Each illustrates a different facet of the problem, and two of them sit right on the borders of the subcontinent.

The Pashtuns and the Durand Line 🔗

The Durand Line is perhaps the most relevant example for a South Asian audience. Drawn in 1893 by Sir Mortimer Durand and the Afghan Emir Abdur Rahman Khan, this 2,640-kilometre line was meant to demarcate British India from Afghanistan. In doing so, it sliced straight through the Pashtun tribal lands, placing some Pashtun tribes under British administration while others remained in Afghanistan.

After the partition of British India in 1947, Pakistan inherited this border, but Afghanistan has never accepted it as a legitimate international boundary. Kabul argued that the line was imposed by a colonial power and therefore void. Out of this dispute grew the demand for Pashtunistan, a movement for an independent or unified Pashtun homeland spanning both countries. As one study of the region explains, the Durand Line divided a population intimately related by culture, history, and blood, turning the frontier into one of the most volatile zones on earth.

The consequences are visible today. Tribes routinely ignore the border to attend weddings and tribal councils, while the same porous frontier has become a haven for militant groups. Pakistan’s attempt to fence the line from 2017 onward has been met with resistance from the Afghan side, which views the fence as the formalisation of an illegitimate division.

The Baloch across three states 🔗

The Baloch people face a similar fate, fragmented across Pakistan, Iran, and Afghanistan. In the nineteenth century, agreements between the Persian and British empires drew the modern borders that split the Baloch nation into three administrative regions. The British carved up resource-rich Balochistan partly to secure a buffer against Russian expansion, with little thought for the ethnolinguistic community living there.

The Baloch strongly resisted recognising borders that divided their families and tribes, and this refusal has fed decades of insurgency, particularly in Pakistan. Importantly, Baloch nationalism also illustrates the double edge of irredentism. Scholars note that movements seeking a “Greater Balochistan” can themselves become irredentist, raising the question of how neighbouring states like Iran would respond to a unified Baloch homeland carved partly out of their own territory.

The Kurds as the defining example 🔗

Returning to the Kurds completes the picture. Spread across four states, denied a homeland, and repeatedly repressed, they show how an irrational boundary can leave a people in a permanent state of struggle. From the Kurdistan Workers’ Party (PKK) insurgency in Turkey to the autonomous Kurdish administration that emerged in northern Syria during its civil war, Kurdish history is a continuous response to the borders drawn for them a century ago.

The challenge to the modern state system 🔗

Why does any of this matter for international relations as a discipline? Because the modern state system rests on two principles that irrational boundaries constantly undermine: sovereignty and territorial integrity. The system assumes that each state has clear borders and a population that recognises its authority. Irrational boundaries break both assumptions.

When a state contains a large, alienated minority that wants to join a neighbour or form its own country, its internal legitimacy is weakened. When neighbouring states make irredentist claims on its territory, its external stability is threatened. This is why colonial borders are still described as drivers of underdevelopment and instability long after independence.

Why states cannot simply redraw the lines 🔗

If irrational boundaries cause so much trouble, why not just fix them? The answer reveals a deep tension in international politics. Most post-colonial states, especially in Africa, chose to keep their inherited borders rather than redraw them. The African Union and its predecessor adopted a principle of border non-alteration, fearing that opening one boundary for revision would trigger endless territorial wars across the continent.

This is the great dilemma. Keeping irrational boundaries preserves the immediate peace between states but locks in long-term internal conflict. Redrawing them might satisfy ethnic claims but could unleash chaos as every group demands its own revision. The state system, in effect, has decided that flawed stability is safer than the risk of redrawing the map.

The lasting legacy 🔗

The partition of British India in 1947 is the example closest to home. It created new boundaries that separated communities who had lived together for centuries, triggering one of the largest forced migrations in history and a conflict over Kashmir that continues to shape regional politics today. It is a reminder that the consequences of a single act of boundary-drawing can echo for generations.

Irrational boundaries, then, are not a historical curiosity. They are a living force in international relations, generating ethnic conflict, fuelling separatist movements, and constantly testing the legitimacy of the states that inherited them. Until the world finds a way to reconcile the map of states with the map of peoples, these tensions will remain at the centre of global politics.

What do you think? If redrawing irrational boundaries risks even greater conflict, is it ethical for the international community to ask divided peoples like the Kurds or Baloch to remain within borders they never chose? And could a future state system be built on identity and consent rather than on lines inherited from empire?

References

1. https://www.trtworld.com/article/95e68178bed9
2. https://generalswarroom.substack.com/p/the-pashtun-tribe-and-the-durand
3. https://www.cfr.org/articles/kurds-long-struggle-statelessness
4. https://dckurd.org/kurdistan/
5. https://www.fairplanet.org/dossier/beyond-citizenship/the-kurds-a-stateless-nation/
6. https://www.britannica.com/event/Durand-Line
7. https://www.efsas.org/publications/study-papers/the-durand-line-a-razors-edge-between-afghanistan-and-pakistan/
8. https://www.tandfonline.com/doi/full/10.1080/17467586.2024.2356508
9. https://journals.sagepub.com/doi/full/10.1177/1879366520901920
10. https://www.wilsoncenter.org/blog-post/colonial-borders-in-africa-improper-design-and-its-impact-on-african-borderland-communities
11. https://fiveable.me/ap-world/unit-8/newly-independent-states-after-1900/study-guide/NoQFoa9qdFGo2LySiZl7