Day of Revenge settlers by the 1960s. The Italian population was concentrated in the coast around the cities of Tripoli (37 percent of its population) and Bengasi (31 percent). With the Italian defeat in World War II, Italian influence waned. After several years under British mandate, on 24 December 1951 Libya declared its independence as the United Kingdom of Libya (a constitutional, hereditary monarchy under King Idris). Although many Italians had already left the former colony, many remained (primarily farmers and craftsmen). King Idris was a tolerant monarch, and generally treated the Italian population well. Libyan Jews (who had lived in Libya since
Italian East Africa (Citao)" (Mechanic & Transport industry). Italians even created new airports and in 1936 started the worldwide famous "Linea dell'Impero", a flight connecting Addis Abeba to Rome. The line was opened after the Italian conquest of Ethiopia and was followed by the first air links with the Italian colonies in Africa Orientale Italiana (Italian East Africa), which began in a pioneering way since 1934. The route was enlarged to 6,379 km and initially joined Rome with Addis Ababa via Syracuse, Benghazi, Cairo, Wadi Halfa, Khartoum, Kassala, Asmara, Dire Dawa. There was a change of aircraft in Benghazi (or sometimes in Tripoli).