Many of the divisions between the Tutsi and Hutu are believed to have originated during Burundi's colonial occupation. A culture of 'racial' differentiation, prevalent in the first half of the 20th century in Europe, was introduced in Burundian society. It depicted the Tutsi (about 18 percent of the population) as the'racially superior' dominant people, and the Hutu (about 80 percent of the population) as'racially' bound to be servants of the Tutsi.