Currently, Nigeria is suffering from massive regional disparities. Like most nations with straight borders, those borders were drawn by long-dead white guys who had never walked the land nor sailed the rivers. Far too often European colonists drew borders that forced three or more tribes to coexist in an artificial country.
The Northern Nigerian desert is mostly Muslim and plagued by Bomo Haram.
Meanwhile the southern coastal swamps are underlaid with massive oil reserves. However, traditional fishermen and swamp-dwellers complain of pollution and poverty as oil revenues only benefit urban elites.
If Biafrans had been able to seize oil reserves circa 1960, the Ibos would have been far to wealthy for the Nigerian Army to re-conquer.