South-Eastern State

After independence in 1960, the area of now-Cross River was a part of the post-independence Eastern Region until 1967 when the region was split and the area became part of the South-Eastern State. Less than two months afterwards, the Igbo-majority former Eastern Region attempted to secede as the state of Biafra; in the three-year long Nigerian Civil War, Calabar and its port was hard fought over in Operation Tiger Claw while people from Cross River were persecuted by Biafran forces as they were mainly non-Igbo. At the war's end and the reunification of Nigeria, the South-Eastern State was reformed until 1976 when it was renamed Cross River State. Eleven years later, Cross River State was divided with western Cross River being broken off to form the new Akwa Ibom State. The state formerly contained the oil-producing Bakassi Peninsula, but it was ceded to Cameroon under the terms of the Greentree Agreement.