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
1960s in Angola exports doubled between 1965 and 1970 to 170 million pounds. In the district of Huambo, between 1968 and 1970 white-owned land more than doubled from 249,039 hectares to 526,270 hectares. Native-owned land decreased by 36.5%. The average African farm's gross income declined between 1964 and 1970 from $98.00 to $35.00 Portuguese petroleum-production began in Congo basin in the 1960s, and in the exclave of Cabinda in 1968. Now the petroleum industry is the engine of the Angolan economy. 1960s in Angola The 1960s in Angola were marked by the War of Independence (1961–1975). Portuguese police arrested Agostinho Neto of the