After gaining its independence on 30 June 1960, following riots in 1959, the Republic of the Congo elected its first prime minister, Patrice Lumumba. Lumumba's perceived pro-Soviet leanings were viewed as a threat by Western interests. This being the height of the Cold War, the U.S. and Belgium did not want to lose control of the strategic wealth of the Congo, in particular its uranium. Less than a year after Lumumba's election, the Belgians and the U.S. bought the support of his Congolese rivals and set in motion the events that culminated in Lumumba's assassination. In 1964, Moïse Tshombe decreed the expulsion of all nationals of Republic of the Congo, Burundi and Mali, as well as all political refugees from Rwanda. In 1965, with the help of the U.S. and Belgium, Joseph-Désiré Mobutu seized power in the Congo. He initiated a policy of "Authenticity" the names of people and places in the country. In 1966, Léopoldville was renamed ''Kinshasa'', for a village named Kinshasa that once stood near the site, today Kinshasa (commune). The city grew rapidly under Mobutu, drawing people from across the country who came in search of their fortunes or to escape ethnic strife elsewhere, thus adding to the many ethnicities and languages already found there.