1990s in Angola government, UNITA, and the UN with the governments of Portugal, the United States, and Russia observing, to oversee its implementation. Violations of the protocol's provisions would be discussed and reviewed by the commission. The protocol's provisions, integrating UNITA into the military, a ceasefire, and a coalition government, were similar to those of the Alvor Agreement which granted Angola independence from Portugal in 1975. Many of the same environmental problems, mutual distrust between UNITA and the MPLA, loose international oversight, the importation of foreign arms, and an overemphasis on maintaining the balance of power, led to the protocol's collapse. In January
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