An Original Contribution to the Theory of Demographic Change and State Fragility in the Sahel-Nigeria Border Zone

The demographic characteristics of Nigeria's Sahel border zone, including high fertility, large youth populations, and high displacement, interact with governance deficits to produce state fragility dynamics that are inadequately theorised in both demographic and political science scholarship. This study developed an original theory of demographic change and state fragility in the Sahel-Nigeria border zone, covering the interface of Borno, Yobe, Zamfara, Sokoto, and Kebbi States with Niger, Chad, and Cameroon. A constructive theoretical methodology was employed, combining systematic review of demographics-security nexus literature (62 publications from 2018 to 2024), empirical analysis of demographic, conflict, and governance indicators from ACLED, NBS, and UNDP datasets across the border zone, and expert consultation with 25 demographers, security analysts, and development economists. The theoretical analysis identified four demographic-fragility interaction mechanisms: youth bulge vulnerability (large young population without economic absorption generating recruitment pools for armed groups), displacement-governance spiral (displacement undermining state legitimacy while state fragility perpetuates displacement), cross-border demographic pressure (population movement across porous borders complicating service delivery and social contract), and environmental demographic pressure (land degradation and population growth producing resource conflict). The original Demographic-Fragility Nexus Framework for the Sahel-Nigeria Border Zone proposes intervention leverage points across demographic, economic, and governance dimensions. Expert review confirmed the framework's original theoretical contribution to demographic security studies.

Keywords: demographic change, state fragility, Sahel border, Nigeria, security demography