The Portuguese Colonial War (Portuguese: Guerra Colonial Portuguesa), also known in Portugal as the Overseas War (Guerra do Ultramar) or in the former colonies as the War of Liberation (Guerra de Libertação), and also known as the Angolan, Guinea-Bissau and Mozambican War of Independence, was a thirteen year long conflict fought between Portugal's military and the emerging nationalist movements in Portugal's African colonies between 1961 and 1974. The Portuguese ultra-conservative regime at the time, the Estado Novo, was overthrown by a military coup in 1974, and the change in government brought the conflict to an end. The war was a decisive ideological struggle in Lusophone Africa, surrounding nations, and mainland Portugal.