Siege of Saïo the Italian dictator, Benito Mussolini, proclaimed the colony of "Africa Orientale Italiana" (AOI, Italian East Africa), formed from Ethiopia (after the Italian victory in the Second Italo-Ethiopian War, fought 3 October 1935 – May 1936) and the existing Italian possessions of Italian Eritrea and Italian Somaliland. On 10 June 1940, Mussolini declared war on Britain and France, which made Italian military forces in Libya a threat to Egypt and those in Italian East Africa a danger to the British and French colonies in East Africa. Italian belligerence also closed the Mediterranean to Allied merchant ships and endangered British supply routes
Italian East Africa Italian East Africa Italian East Africa () was an Italian colony in the Horn of Africa. It was formed in 1936 through the merger of Italian Somaliland, Italian Eritrea, and the newly occupied Ethiopian Empire which became Italian Ethiopia. During the Second World War, Italian East Africa was occupied by a British-led force including colonial and Ethiopian units. After the war, Italian Somaliland and Eritrea came under British administration, while Ethiopia regained full independence. In 1949, Italian Somaliland was reconstituted as the Trust Territory of Somaliland, which was administered by Italy from 1950 until its independence in 1960. When established