Administration of the Congo Free State was taken over by the Belgian government in 1908 following controversies engendered by the atrocities committed by Leopold's forces there. The Belgian Congo gained independence (as the Republic of the Congo, later renamed Democratic Republic of the Congo) on 30 June 1960. Portugal however firmly resisted the wave of decolonisation in Africa, making Angola a legal part of Portugal in 1951. Angolan nationalists began fighting for independence in 1961, achieved in 1975 following a revolution in Portugal. Cabinda meanwhile sought to establish a separate state, kick-starting the Cabinda War. The southern border section has also been unstable for much of this period also, due to civil wars in Angola and Congo, resulting in numerous cross-border incursions and refugee flows.