Ow do we explain the development of intrastate or civil conflict?

this essay is for a Security Challenges subject in Master degree. for this essay we mostly talked about the SUB-SAHARAN AFRICA CIVIL CONFLICT. examples are very important in this essay. explain how civil conflict developed in SUB AFRICA countries and also other Regine if needed.

Referencing Requirements:
Collier (2008) The Bottom Billion: why the poorest countries are falling and what can be done about it. Oxford University Press

A Nhema and P T Zeleza (eds.2008) The Roots of African Conflicts: the causes and costs.

James D. Fearon and David D. Laitin. Ethnicity, Insurgency, and Civil War. Stanford University (Vol. 97, No.1)2003

P Collier A Hoeffler (2002) On the Incidence of Civil War in Africa. The Journal of Conflict Resolution 46(1)