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<p>Secession imposes significant structural shocks on parent states, yet its causal impact on economic development remains understudied in Africa. This paper investigates the developmental consequences of territorial fragmentation in Africa, using Sudan’s 2011 secession of South Sudan as a natural experiment. Applying the synthetic control method to a panel of African countries from 2000–2019, I find that secession reduced Sudan’s real GDP per capita by an average of 10.95%, with losses intensifying to 25.79% by 2019. These effects are robust across multiple estimators, including <i>inter alia</i> bias-corrected and matching-based synthetic controls, matrix completion with nuclear norm regularisation, and Bayesian structural time-series, consistently pointing to a sharp and persistent decline in development. Alternative specifications confirm a substantial drop in both real GDP per capita levels (− $180) and growth rates (− 2.46%) post-secession. These findings underscore the economic fragility of postcolonial states facing ethnopolitical fragmentation and highlight the long-run costs of territorial disintegration. They also suggest that regional institutions and international actors should prioritise conflict prevention mechanisms in secession-prone contexts, where the developmental stakes of political rupture are particularly acute.</p>

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Breaking away: development burdens of secession in Africa

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Fayssal Ayad

摘要

Secession imposes significant structural shocks on parent states, yet its causal impact on economic development remains understudied in Africa. This paper investigates the developmental consequences of territorial fragmentation in Africa, using Sudan’s 2011 secession of South Sudan as a natural experiment. Applying the synthetic control method to a panel of African countries from 2000–2019, I find that secession reduced Sudan’s real GDP per capita by an average of 10.95%, with losses intensifying to 25.79% by 2019. These effects are robust across multiple estimators, including inter alia bias-corrected and matching-based synthetic controls, matrix completion with nuclear norm regularisation, and Bayesian structural time-series, consistently pointing to a sharp and persistent decline in development. Alternative specifications confirm a substantial drop in both real GDP per capita levels (− $180) and growth rates (− 2.46%) post-secession. These findings underscore the economic fragility of postcolonial states facing ethnopolitical fragmentation and highlight the long-run costs of territorial disintegration. They also suggest that regional institutions and international actors should prioritise conflict prevention mechanisms in secession-prone contexts, where the developmental stakes of political rupture are particularly acute.