 Ruanda-Urundi was a part of German East Africa under Belgian military occupation from 1916 to 1924 in the aftermath of World War I, when a military expedition had removed the Germans from the colony.It became a League of Nations world B mandate allotted to Belgium, from 1924 to 1945.It was designated as a United Nations trust territory, still under Belgian administration, until 1962, when it developed into the independent states of Rwanda and Burundi.