However, many new states were plagued by cronyism; exclusion of all but friends, corruption; which erodes trust, and tribalism; rivalry between ethnic groups within the nation. This sometimes resulted in their near-disintegration, such as the attempt by Biafra to secede from Nigeria in 1970, or the continuing demand of the Somali people in the Ogaden region of Ethiopia for complete independence. The Rwandan genocide as well as the recurrent problems experienced by the Sudan can also be related to a lack of ethnic, religious, or racial cohesion within the nation. It has often proved difficult to unite states with similar ethnic but different colonial backgrounds. Whereas some consider Cameroon to be an example of success, fractures are emerging in the form of the Anglophone problem. Failures like Senegambia Confederation demonstrate the problems of uniting Francophone and Anglophone territories.