From 1933 to 1974, Portugal became an authoritarian state (ruled by António de Oliveira Salazar). There was a fierce determination to maintain the colonial possessions at all costs, and aggressively defeat any insurgencies. In 1961 India anexed Goa and by the same year nationalist forces began organizing in Portugal, and the revolts (preceding the Portuguese Colonial War) spread to Angola, Guinea Bissau and Mozambique. Lisbon escalated its effort in the war: for instance, it increased the number of natives in the colonial army and built strategic hamlets. Portugal sent another 300,000 European settlers into Angola and Mozambique until 1974. In 1974, a left-wing revolution inside Portugal destroyed the old system and encouraged pro-Soviet elements to attempt to seize control in the colonies. The result was a very long and extremely difficult multi-party Civil War in Angola, and lesser insurrections in Mozambique.