It locates the place of Yam in Nigeria Society in general and Igbo society in particular. It shows the stages of human development from early time and how these stages evolved with change in human environment. Finally it dealt on state formation which is the super structure of the base.
This work attempts a conceptualization of Historical Explanation, and discusses its variants. It also attempts to solve the problem of significance of historical explanation by discarding the methodological view according to which the natural sciences have been solely subjected and also dispels explanation from the realm of social sciences as based solely on understanding. Rather, it supposes that an employment of both cores would produce a balance