Cuban intervention in Angola the requested financial assistance (100,000US$) it received from Yugoslavia. Portugal's sudden retreat from Angola and Mozambique in 1975 ended a history of South African military and intelligence cooperation with Portugal against the Angolan and Namibian independence movements dating back to the 1960s, later formalized in a secret alliance codenamed Alcora Exercise. It also ended economic cooperation with regard to the Cunene hydro-project at the Angolan-Namibian border, which South Africa had financed. South African involvement in Angola, subsumed under what it called the South African Border War, started in 1966 when the conflict with the Namibian independence movement, South West Africa
Agriculture in Angola traders in exchange for supplies. The commercial farmers dominated the marketing for these crops, however, and enjoyed substantial support from the colonial government in the form of technical assistance, irrigation facilities, and financial credit. They produced the great majority of the crops that were marketed in the cities or exported. Before 1975, Angola had a flourishing tradition of family-based farming and was self-sufficient in all major food crops except wheat. The country exported coffee and maize, as well as crops such as sisal, bananas, tobacco and cassava. By the 1990s Angola was producing less than 1 per cent of the