Portuguese Angola Portuguese protectorate by the 1885 Treaty of Simulambuco. Sometime during the 1920s, it became incorporated into the larger colony (later the overseas province) of Portuguese Angola. The two colonies had initially been contiguous, but later became geographically separated by a narrow corridor of land, which Portugal ceded to Belgium allowing Belgian Congo access to the Atlantic Ocean. Following the decolonisation of Portuguese Angola with the 1975 Alvor Agreement, the short-lived Republic of Cabinda unilaterally declared its independence. However, Cabinda was soon overpowered and re-annexed by the newly proclaimed People's Republic of Angola and never achieved international recognition. Portuguese explorers and
Angola–Namibia relations the fighting in Namibia would eventually drive at least 43,000 Namibian refugees into exile in Angola, many of whom joined PLAN. Following Angolan independence in 1975, SWAPO established a formal alliance with Angola's new ruling party, the People's Movement for the Liberation of Angola (MPLA). After being expelled from Zambia between 1976 and 1979, PLAN was permitted by the MPLA to establish its regional headquarters inside Angola. Access to bases inside Angola provided PLAN with opportunities to train its forces in secure sanctuaries and infiltrate insurgents and supplies across Namibia's northern border. The MPLA government also permitted shipments of arms