The country became independent when the Portuguese left the country after the Carnation Revolution in 1974. The African Party for the Independence of Guinea and Cape Verde, which had led the insurrection for independence for 12 years, won the general elections and Luis Cabral was elected president. On 14 November 1980, João Bernardo Vieira overthrew President Luís Cabra, who had been in power since independence, in a bloodless military coup d'état. The constitution was suspended. In 1984, a new constitution was approved and brought the country back to civilian rule. The ban on political parties was lifted in 1991 and elections were held in 1994. After a failed coup attempt against the government in June 1998, the country fell into a brief but violent civil war between the military forces. On 12 April 2012, a coup led by the army deposed Prime Minister Carlos Gomes Júnior in the context of a disputed presidential election. In 2014, José Mário Vaz won the presidential election of 13 April 2014, marking the gradual return to constitutional legality. In September 2016, a political compromise was signed on 10 September by all the parties. Successively, Umaro Sissoco Embaló in November 2016, then Artur Silva at the end of January 2018, and then Aristides Gomes in mid-April 2018 were appointed prime ministers.