Rwanda any further movement between the classes. Belgium continued to rule Ruanda-Urundi (of which Rwanda formed the northern part) as a UN Trust Territory after the Second World War, with a mandate to oversee eventual independence. Tensions escalated between the Tutsi, who favoured early independence, and the Hutu emancipation movement, culminating in the 1959 Rwandan Revolution: Hutu activists began killing Tutsi and destroying their houses, forcing more than 100,000 people to seek refuge in neighbouring countries. In 1961, the suddenly pro-Hutu Belgians held a referendum in which the country voted to abolish the monarchy. Rwanda was separated from Burundi and gained
Rwanda for export. Tourism is a fast-growing sector and is now the country's leading foreign exchange earner. Rwanda is one of only two countries in which mountain gorillas can be visited safely, and visitors pay high prices for gorilla tracking permits. Music and dance are an integral part of Rwandan culture, particularly drums and the highly choreographed "intore" dance. Traditional arts and crafts are produced throughout the country, including "imigongo", a unique cow dung art. The name "Rwanda" is derived from the Rwanda-Rundi word "rwanda" meaning "domain" or literally an "area occupied by a swarm". The official name of the country