Grieving for the 140 victims of a January 2024 attack in north-central Nigeria.AP Photo/Sunday Alamba Augustine Aboh, University of Massachusetts Over the past two decades, Nigeria has grappled with multiple and complex national security threats, each posing a significant challenge to its stability. The nation finds itself fighting a violent militancy in the Niger Delta, conflicts between farmers and herders across multiple regions, terrorism and insurgency in the northeast, banditry in the northwest and secessionist campaigns by groups such as the Indigenous People of Biafra in the southeast….