This article critically examines the rise of various liberation movements in Angola and their overall impact on the colonial administrative institutions. This paper also analyses the role of both the internal situations prevailing in Angola and the external factors associated with the Second World War. In this process, this paper has thoroughly analyzed the outbreak of the Armed Rebellion of 1961 and its far-reaching impact on the colonial administrative structure. The vital contribution of the three key liberation movements namely, the Popular Liberation Movement of Angola (MPLA). The National Front for the Liberation of Angola (FNLA) and the National Union for the Total Independence of Angola (UNITA) has also been examined in comparative perspective.