Underdevelopment has plagued Sub-Saharan Africa (SSA), since independence the post-colonial African states have experienced extreme poverty, unemployment, and other economic ailments that have persisted in the region. The aim of this thesis is to critique the null hypothesis of dependency theorists that it is structural factors that cause underdevelopment instead this study proposes an alternative hypothesis through Neo-Classical Realism to explain that it is in fact state-level actors and domestic issues that are the true culprit of causing the dependent variable. The methodological approach is a single embedded case-study with an explaining-outcome process-tracing. The thesis found that the cause of the underdevelopment in Nigeria is firmly rooted in the domestic sphere and that it delves much deeper than the main factors; resource dependence, lax institutions, prebendalism, and Sino-Nigerian relations, but it is the socio-political culture that has produced the norms which the elites operate on and possibly contributing to the exasperation of the negative aspects of the main factors that have perpetuated and sustained underdevelopment in Nigeria and SSA.