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 independence on 1 July 1962, which is commemorated as Independence Day, a national holiday. Cycles of violence followed, with exiled Tutsi attacking from neighbouring countries and the Hutu retaliating with large-scale slaughter and repression of the Tutsi. In 1973, Juvénal Habyarimana took power in a military coup. Pro-Hutu discrimination continued, but there was greater economic prosperity and a reduced amount of violence against Tutsi. The Twa remained marginalised, and by 1990 were almost entirely forced out of the forests by the government; many became beggars. Rwanda's population had increased from 1.6 million people in 1934 to 7.1 million in 1989, leading to competition for land.