Every country on earth is faced with the problem of security challenges in her process of national development; it is not peculiar to Nigeria. But the security challenges confronting Nigeria is capable of disintegrating the Country and even metamorphose to civil war. The experiences of Nigerians during her civil war from 1966 to 1970 called for caution and academic intervention in other not to cause disaffection, disunity and human suffering. This paper seeks to probe into the etiology of security challenges in Nigeria, draw a nexus between security challenges and national unity and seek for prevention of these causes of security challenges in Nigeria. This paper is aimed at enhancing national unity, good governance and sensitizing Nigeria ...