History of Chad Africa's major language groupings south of the Sahara Desert (except Khoisan, which is not considered a valid genetic grouping anyway), i. e. the Afro-Asiatic, Nilo-Saharan and Niger–Congo phyla, originated in prehistoric times in a narrow band between Lake Chad and the Nile Valley. The origins of Chad's peoples, however, remain unclear. Several of the proven archaeological sites have been only partially studied, and other sites of great potential have yet to be mapped. At the end of the 1st millennium AD, the formation of states began across central Chad in the sahelian zone between the desert and the savanna. For
Chad–Nigeria relations Chad–Nigeria relations Nigeria considered France its primary rival in its attempt to chart the course of West Africa's political development. Its generally paternalistic relations with Chad intensified after the coup that ousted President François Tombalbaye in 1975. After that, limiting Libyan expansion while avoiding direct clashes with Libyan troops also became important goals. Nigeria sponsored talks among Chad's rival factions in 1979 and promoted a little-known civil servant, Mahmat Shawa Lol, as a compromise head of a coalition government. Lol's perceived status as a Nigerian puppet contributed to mounting opposition during his short term as president in 1979. The two