 Following negotiations held in Portugal, itself experiencing severe social and political turmoil and uncertainty due to the April 1974 revolution, Angola's three main guerrilla groups agreed to establish a transitional government in January 1975.Within two months, however, the FNLA, MPLA and UNITA had started fighting each other and the country began splitting into zones controlled by rival armed political groups.The MPLA gained control of the capital Luanda and much of the rest of the country.