Angola's rich agricultural sector was formerly the mainstay of the economy and currently provides employment for the majority of the people. Food must be imported in large quantities, however, because of the disruption caused by the country's protracted civil war. All areas of production suffered during the fighting that began in 1975. Coffee and sugarcane are the most important cash crops. Sisal, corn, cotton, manioc, tobacco, and bananas are raised, and fishing is also important. Livestock, notably cattle, sheep, goats, and pigs, is raised in much of the savanna region.
Angola has substantial mineral resources and hydroelectric power. Most large-scale industries are nationalized. Oil, chiefly from reserves offshore, is the most lucrative product, providing about 50% of the country's GDP and 90% of its exports. Oil revenues have not done much to improve the economy at large or the everyday lives of Angolans, especially in the interior, because huge sums have been spent on the armed forces and lost due to government corruption; unaccounted losses to government funds were estimated at $32 billion in 2011. Diamond mining is also a principal industry; for many years in the late 20th cent. revenue from the mines supported UNITA rebels (see under Postcolonial History ). Natural gas is produced, and Angola has deposits of iron ore, phosphates, copper, feldspar, gold, bauxite, and uranium. Industries include metals processing, meat and fish processing, brewing, and the manufacture of cement, tobacco products, and textiles.
The Benguela railroad, which carries metals from the mines of Congo (Kinshasa) and the Zambian Copperbelt, was an important source of revenue, but much of the line fell into disrepair during the civil war. Angola's road network and communications system have also been affected by civil strife. In 2005, the government began using a line of credit from China to help rebuild the country's infrastructure; rail lines began resuming service in 2010. Luanda and Lobito are Angola's main shipping ports. The country's main trading partners are the United States, China, South Korea, Portugal, and France. Angola is a member of the Southern African Development Community.