This chapter examines peacebuilding in the context of violent conflicts in Nigeria using Immanuel Kant’s theory of “Perpetual Peace”, taking into account the role that religion and ethnicity play in protracting conflict in the country. It raises the issue of justice, considering it from the perspective of fairness, equality, and management as a preventive measure, engaging political, reorientation, and economic solutions. It seeks to show how Kant’s concept of Republicanism that emphasises equal rights of representation to challenge the Nigerian system, especially in the current political configuration that encourages hegemony in the face of intricately varied religious and ethnic compositions. How can ethno-religious diversity be managed to achieve sustainable peace within Nigeria’s democratic space? How may economic involvement and reorientation help Nigerians achieve sustainable peaceful coexistence?