Country in W Africa, bounded to the N by Senegal, E and SE by Guinea, and SW by the Atlantic. government Guinea-Bissau is a one-party state, the 1984 constitution describing the African Party for the Independence of Portuguese Guinea and Cape Verde (PAIGC) as `the leading force in society and in the nation'. Although Cape Verde chose independence, the title of the original party which served the two countries has been retained. The constitution also provides for a 150-member national people's assembly, all nominees of PAIGC. The assembly elects the president, who is head of both state and government. Policy is determined by PAIGC and it is there that ultimate political power lies, the president being its secretary-general. history Guinea-Bissau was first reached by Europeans when the Portuguese arrived in 1446, and became a slave trading centre. Until 1879 it was administered with the Cape Verde islands, but then became a separate colony under the name of Portuguese Guinea. Nationalist groups began to form in the 1950s and PAIGC was established in 1956. Portugal refused to grant independence, fighting broke out, and by 1972 PAIGC claimed to control two-thirds of the country. The following year the `liberated areas' were declared independent and in 1973 a national people's assembly was set up and Luiz Cabral appointed president of a state council. Some 40,000 Portuguese troops were engaged in trying to put down the uprising and were suffering heavy losses but, before a clear outcome was reached, a coup in Portugal ended the fighting and PAIGC negotiated independence with the new government in Lisbon. In 1974 Portugal formally acknowledged Guinea-Bissau as a sovereign nation. PAIGC began to lay the foundations of a socialist state, intended to include Cape Verde, but in 1980, four days before approval of the constitution, Cape Verde withdrew, feeling that Guinea-Bissau was being given preferential treatment. A coup deposed Cabral and Joao Vieira became chair of a council of revolution. At its 1981 congress, PAIGC decided to retain its name, despite Cape Verde's withdrawal, and its position as the only party was confirmed, with Vieira as secretary-general. Normal relations between the two countries were restored in 1982. In 1984 a new constitution made Vieira head of government as well as head of state. In June 1989 he was re-elected for another five-year term. The people of Guinea-Bissau have a life expectancy of 39 years, the lowest in the world. In 1990 the infant mortality rate was 14.8%.