Answer:
The problem of Angola's borders has been raised since the mid-nineteenth century.
Portugal and England reach agreement on the delimitation of Angola's border following the 1891 agreements. Still, the question of Angola's borders will not be settled until the 1920s. In the north, despite the Convention with the Independent State of Congo of May 1890, this issue is only dealt with, already in the Republic, by the 4th Lobito Convention: Portugal cedes part of the M'Pozo region and receives territories in the Cassai area. The Luso-English Arrangement of June 11, 1891, had resolved the border with Northern Rhodesia but had left the Barotze undefined. In August 1903, Portugal and Great Britain set the basis for arbitration in the matter of the Barotze kingdom, granted to the King of Italy. The arbitration award is from May 1905, followed by the 1915 protocol for demarcation of the Angolan and Rhodesia border, described in the arbitral award as Barotze kingdom. The Republic would have problems with the southwest borders, notably because of a dispute with Germany. After the First World War, this colony will be under the mandate of the Union of South Africa, and its border will be set by the 1920 and 1926 conferences. In June 1926, an agreement is signed and signed in Cape Town. the government of the Portuguese Republic and that of the Union of South Africa concerning the border line between the province and the territory of southwest Africa, under mandate. The boundary delimitation of what became the Cabinda Enclave stemmed from the 1885 Berlin Act and subsequent agreements with France and Congo.
