Congo achieved independence from Belgium on 30 June 1960 under the name Republic of the Congo. Congolese nationalist Patrice Lumumba was elected the first Prime Minister, while Joseph Kasa-Vubu became the first President. During the Congo Crisis, Joseph-Désiré Mobutu, who later renamed himself Mobutu Sese Seko, officially came into power through a coup d'état and renamed the country Zaire in 1971. The country was run as a dictatorial one-party state, with his Popular Movement of the Revolution as the sole legal party. By the early 1990s, Mobutu's government began to weaken. Destabilisation in the east resulting from the 1994 Rwandan genocide led to a 1996 invasion led by Rwanda, which led to Mobutu's ousting in the First Congo War the following year.