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World War II or the Second World War was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks and aircraft played major roles, enabling the strategic bombing of cities and delivery of the first and only nuclear weapons ever used in war. World War II is the deadliest conflict in history, causing the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were tried for war crimes.
The East African campaign was fought in East Africa during the Second World War by Allies of World War II, mainly from the British Empire, against Italy and its colony of Italian East Africa, between June 1940 and November 1941. The British Middle East Command with troops from the United Kingdom, South Africa, British India, Uganda Protectorate, Kenya, Somaliland, West Africa, Northern and Southern Rhodesia, Sudan and Nyasaland participated in the campaign. These were joined by the Allied Force Publique of Belgian Congo, Imperial Ethiopian Arbegnoch and a small unit of Free French Forces.
Italian East Africa was a colonial possession of Fascist Italy from 1936 to 1941 in the Horn of Africa. It was established following the Second Italo-Ethiopian War, which led to the military occupation of the Ethiopian Empire (Abyssinia). It encompassed Italian Somaliland, Italian Eritrea and the acquired Ethiopian territories, all governed by a single administrative unit, the Governo Generale dell'Africa Orientale Italiana. Its establishment contributed to the outbreak of the Second World War by exposing the weaknesses of the League of Nations.