The Line a Cartographer Drew in Berlin
You are standing in the Sahel in the 1880s, watching a surveyor drag a theodolite across ground he has never walked before and will never walk again. He is not counting people. He is not asking who farms which valley, or which group has grazed the plateau for five generations, or where the water runs in the dry season and what that means for who survives. He is following a compass bearing, filling a quota of territory on a map that will be ratified in a European conference room thousands of miles away by men who are, at that precise moment, eating well. The line he draws will still be an international border a hundred and forty years later. And somewhere along its length, with high statistical probability, people will be shooting at each other.
This is not metaphor. It is one of the more robust findings in quantitative political science: borders drawn by colonial administrators, with little regard for the ethnic, linguistic, or ecological communities they bisected, produce measurably higher rates of internal armed conflict than borders that emerged from local wars, treaties, or demographic logic. Understanding why that mechanism works is the part most explainers skip entirely.
Partitioned Peoples and Fused Rivals
Colonial boundary-drawing created two distinct problems that look opposite but cause similar damage.
The first is partition. A single ethnic or linguistic community split across two or more states. The Ewe people were divided between British Gold Coast (later Ghana) and German Togoland (later Togo). The Somali were scattered across five territories: Italian Somaliland, British Somaliland, French Djibouti, the Ogaden region of Ethiopia, and the Northern Frontier District of Kenya. When those territories became independent states, the Somali in each found themselves minorities in countries where they had no particular loyalty, with kin across a border the colonial power had drawn for administrative convenience. The irredentist logic that followed, the pull toward reunification with co-ethnics, fed the Ogaden War, the collapse of the Somali state, and decades of regional instability.
Political scientists Nathan Nunn and Stelios Michalopoulos published research showing that ethnic groups partitioned by colonial borders exhibit significantly higher levels of civil conflict than unpartitioned groups, even after controlling for poverty, geography, and political institutions. The mechanism is not mysterious: a group split across a border has less political weight in each state, more grievance about the border's legitimacy, and a potential external base of support across the line, which makes insurgency cheaper to sustain.
The second problem is amalgamation. Shoving rival or simply unrelated communities into a single colonial administrative unit, then handing that unit independence as a single country. Nigeria is the canonical case, and it is a damning one. The British merged the largely Muslim, Hausa-Fulani north with the predominantly Yoruba southwest and Igbo southeast, communities with distinct political traditions, religions, and economic systems, into one colony for reasons of administrative efficiency. That fusion produced a state that has experienced a civil war (the Biafran secession, which killed between one and three million people), repeated military coups organized partly along ethnic lines, and persistent low-level insurgency in multiple regions simultaneously.
The catch: this doesn't mean every colonial border produces conflict, or that conflict in post-colonial states has no other causes. Poverty matters. Institutions matter. Resource wealth, especially oil and diamonds, matters enormously. Colonial borders are a structural vulnerability, not a deterministic sentence.
How Arbitrariness Gets Institutionalized
Here is the wrinkle that makes the problem self-reinforcing.
When African and Asian states became independent in the mid-twentieth century, they inherited not just the borders but a norm that protected them. The Organization of African Unity, founded in 1963, explicitly adopted the principle of uti possidetis juris: we keep the borders we were handed, however absurd, because the alternative is every newly independent state fighting every neighbor over every disputed line simultaneously. The logic was sound. The cost was that the internal contradictions of those borders got locked in permanently.
So the Somali irredentist had nowhere to go. The Igbo separatist had no internationally recognized exit. The Kurdish population, split across Turkey, Iraq, Syria, and Iran by borders the British and French drew after the First World War, found that every state it lived in had an interest in suppressing its political ambitions. The border became both cause of grievance and guarantor of the state's territorial integrity, a feedback loop with no clean resolution. It is, in this sense, less like a wound and more like a load-bearing crack in a wall everyone has agreed not to mention.
What this produces, structurally, is a particular kind of internal conflict: not revolutions that replace one ruling class with another, but ethnic or regional insurgencies that aim at secession or autonomy and almost never achieve either. They persist at low intensity for decades. The Karen insurgency in Burma has been active since 1949. The conflict in Cabinda, the Angolan enclave separated from the rest of the country by a strip of the Democratic Republic of Congo, is a geographic absurdity created entirely by nineteenth-century Belgian and Portuguese boundary negotiations. These are not accidents of bad governance. They are the structural output of borders that never made sense.
What People Get Wrong About This
The folk version of this argument runs: colonial borders are artificial, therefore they should be redrawn. That folk remedy needs to die, and I will tell you why.
Virtually all borders are arbitrary in some historical sense. The borders of France were settled by wars, dynastic marriages, and annexations across centuries. The borders of the United States involved the dispossession and genocide of indigenous peoples whose own territorial arrangements were completely ignored. Arbitrariness is not unique to colonialism. What is distinctive is the speed, and the total indifference to existing social geography. A border that took three centuries of friction to settle has at least been stress-tested. One drawn in an afternoon by a man with a ruler has not.
Ask yourself: when has redrawing a contested border in an ethnically mixed region actually produced peace rather than a new set of grievances?
More practically, redrawing borders in ethnically mixed regions almost always requires either mass population displacement or the creation of new minorities in the successor states. The partition of British India produced one of the largest forced migrations in human history and roughly one million deaths. The dissolution of Yugoslavia produced ethnic cleansing on a scale Europe had not seen since 1945. New borders do not solve the problem of mixed populations. They typically just reclassify some people from majority to minority and call it progress.
The more honest conclusion is that post-colonial states face a structural deficit in what political scientists call "state legitimacy": the sense among citizens that the state's borders and institutions reflect something meaningful about their community. That deficit can be partially compensated by inclusive institutions, federalism, power-sharing arrangements, economic development. It cannot be wished away by pretending the colonial history didn't happen.
The Inheritance No One Asked For
Take two countries that gained independence in the same decade with similar GDP per capita and similar colonial histories. One happened to have relatively coherent ethnic geography within its inherited borders, its colonial boundary running along a mountain range that already marked a cultural divide. The other had a colonial border that sliced through the middle of three different ethnic homelands and lumped four more together on the other side. Forty years later, the second country has experienced two civil wars and the first has not. The researchers who study this call that a "natural experiment." The people living it call it their lives.
The borders were drawn in a matter of years, often in a matter of weeks, by men who would never live inside them. The consequences have distributed themselves across generations of people who had no vote in the matter. That asymmetry is the thing worth sitting with, because it punctures any comfortable narrative about post-colonial instability being primarily a failure of local governance or culture or will. The structure was broken before the first flag was raised.
Fixing it, if fixing is even the right word, requires something more demanding than redrawing lines: it requires states to build legitimacy they were structurally denied at birth. Some have managed it. The difficulty is that managing it requires precisely the kind of sustained, inclusive institution-building that is hardest to sustain under the pressure of the conflicts the broken borders keep generating. That is not a paradox anyone in Berlin in the 1880s paused to consider.