British Cameroons or British Cameroon was a British mandate territory in British West Africa, formed of the Northern Cameroons and Southern Cameroons. Today, the Northern Cameroons forms parts of the Borno, Adamawa and Taraba states of Nigeria, while the Southern Cameroons forms part of the Northwest and Southwest regions of Cameroon.
Northern Nigeria (or Arewancin Nijeriya) was an autonomous division within Nigeria, distinctly different from the southern part of the country, with independent customs, foreign relations and security structures. In 1962, it acquired the territory of the British Northern Cameroons, which voted to become a province within Northern Nigeria.
In 1967, Northern Nigeria was divided into the North-Eastern State, North-Western State, Kano State, Kaduna State, Kwara State, and the Benue-Plateau State, each with its own Governor.