Colonial Borders Weaken Ethnic Attachments in Africa, Not Strengthen Them

Why This Matters

Christian Houle and Jeffrey Conroy-Krutz challenge a common explanation for ethnicized politics in Africa: that colonial borders, by splitting ethnic groups across new states, strengthened cross-border ethnic ties and diluted national identity. Understanding whether partition intensified or eroded ethnic attachments matters for theories of state building, identity politics, and the long-term legacies of colonial rule.

What Houle and Conroy-Krutz Ask

Do ethnic groups divided by nineteenth-century colonial boundary-making show stronger loyalty to coethnics than to co-nationals, or does partition instead weaken ethnic identity? The authors propose a counterintuitive hypothesis: partitioned groups will display weaker ethnic attachments because colonial division particularly disrupted the traditional institutions that sustained group cohesion.

How the Question Is Tested

• The analysis links georeferenced survey responses from rounds 3–6 of the Afrobarometer to measures of whether and how extensively ethnic groups were split by colonial-era maps.
• The authors compare individual-level attitudes about ethnic and national attachment across members of divided versus non-divided groups, controlling for local and national demographic and political power.
• Results are checked against alternative measures of group partition and a variety of robustness tests to assess the stability of the findings.

How Partition Undermines Ethnic Identity

The authors identify three mechanisms through which colonial partition reduced ethnic attachments:

• Administrative shifts that curtailed the authority of traditional leaders;
• New constraints on leaders’ ability to raise revenues and sustain institutions;
• Reinforced intra-group divisions among co-ethnics who ended up under different colonial administrations and later states.

What They Find

Empirical tests provide consistent support for the authors’ argument: ethnic groups that were partitioned by colonial borders tend to exhibit weaker attachments to their ethnicity than comparable non-partitioned groups. The pattern holds across different operationalizations of “split” and after accounting for groups’ local and national demographic and political positions.

Implications for Scholarship and Policy

These results complicate narratives that treat colonial borders as a straightforward source of cross-border ethnic solidarity. Instead, the disruption of traditional authority and governance appears to have eroded the institutional foundations of ethnic identity in many cases—an insight that reshapes how scholars interpret colonial legacies, contemporary identity politics, and the durability of traditional institutions across African states.