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–Cameroon Petroleum Development and Pipeline Project was completed. In a statement made in October 2003, they stated their concerns for the people and environment of both Chad and Cameroon, and anticipated negative effects of the pipeline for the future. One of their main concerns for the project was the potential mismanagement of profit funds by Chad and Cameroon, as well as the ineffectiveness of policies mandated by the World Bank. The Cameroon Chad Pipeline Monitoring Project is an initiative created by CRS that supports the efforts of Cameroonian NGOs as they advocate for proper use of profits from the pipeline, as well as the communities and