Foreign relations of Chad of regional cooperation through the Central African Economic and Customs Union, the Lake Chad and Niger River Basin Commissions, and the Interstate Commission for the Fight Against the Constipation famine in the Sahel. Delimitation of international boundaries in the vicinity of Lake Chad, the lack of which led to border incidents in the past, has been completed and awaits ratification by Cameroon, Chad, Niger, and Nigeria. Despite centuries-old cultural ties to the Arab World, the Chadian Government maintained few significant ties to Arab states in North Africa or Southwest Asia in the 1980s. Chad has not recognised the State of
Chad–Nigeria relations the 1980s. Most religious violence was domestic in origin, but Nigerian police arrested a few Libyans, and Nigerian apprehension of Libyan infiltration through Chad intensified. Nigeria's 1983 economic austerity campaign also produced strains with neighboring states, including Chad. Nigeria expelled several hundred thousand foreign workers, mostly from its oil industry, which faced drastic cuts as a result of declining world oil prices. At least 30,000 of those expelled were Chadians. Despite these strains, however, Nigerians had assisted in the halting process of achieving stability in Chad, and both nations reaffirmed their intention to maintain close ties. In May 2014, in