Beyond a Single Cause: Atlantic Slave Trade Dependency, Political Fragmentation, and the Decline of the Oyo Empire, c. 1780s-1830s

Scholarship on the Oyo Empire's decline in the early nineteenth century has often emphasized its deepening involvement in the Atlantic slave trade as the primary cause of collapse; this paper interrogates that single-cause explanation and asks whether Oyo's fall is better understood as the product of multiple interacting forces. Employing a qualitative historical method grounded in content and historiographical analysis of primary and secondary sourceschiefly Robin Law's foundational scholarship on Oyo alongside subsequent historical accounts-this paper argues that Oyo's collapse resulted not from the Atlantic slave trade alone, but from the convergence of three interacting forces: structural political fragility rooted in the constitutional tensions between the Alaafin and the Oyo Mesi council; external military and religious pressure from the Fulani jihad and the secession of Ilorin; and economic dependency on Atlantic slave trade revenue, which required sustained warfare to supply captives and thereby strained resources and provoked vassal unrest. The findings show that Oyo's political system was structurally predisposed to internal crisis independent of Atlantic trade dynamics, that dependency on slave trade revenue accelerated resource strain and rebellion among vassal states, and that the Fulani jihad and Ilorin's secession served as the immediate triggering events that converted long-standing internal tensions into terminal collapse; the study further finds that the Yoruba people, largely insulated from enslavement during Oyo's ascendancy, became major victims of the Atlantic trade following the empire's disintegration. The paper concludes that Oyo's decline exemplifies how African participation in the Atlantic slave trade could simultaneously generate genuine political and economic power and produce long-term structural vulnerability, contributing to ongoing debates on African agency by demonstrating that a multi-causal framework offers a more historiographically credible account than trade-centric or purely internalist explanations alone.