German colonial empire
In 1890, Burundi became part of the German colonial empire as part of German East Africa but was not effectively occupied or controlled by the colonial power. During World War I, Belgian troops from the neighbouring Belgian Congo invaded the region and occupied it. The Belgians were awarded Burundi, together with the neighbouring Kingdom of Rwanda, as an international mandate by the League of Nations. The Belgians, however, preserved many of the kingdom's institutions intact.