Sierra Leone (, UK also ), officially the Republic of Sierra Leone, informally Salone, is a country on the southwest coast of West Africa. It has a tropical climate, with a diverse environment ranging from savanna to rainforests. The country has a total area of 71740 km2 and a population of 7,075,641 as of the 2015 census. Sierra Leone is a constitutional republic with a directly elected president and a unicameral legislature. The country's capital and largest city is Freetown. Sierra Leone is made up of five administrative regions: the Northern Province, North West Province, Eastern Province, Southern Province and the Western Area. These regions are subdivided into sixteen districts.
Sierra Leone was a British Crown Colony from 1808 to 1961. Sierra Leone became independent from the United Kingdom on 27 April 1961, led by Sir Milton Margai, who became the country's first prime minister. In May 1962, Sierra Leone held its first general elections as an independent nation. On 19 April 1971, Siaka Stevens' government abolished Sierra Leone's parliamentary government system and declared Sierra Leone a presidential republic. From 1978 to 1985, Sierra Leone was a one-party state in which Stevens' APC was the only legal political party in the country. The current constitution of Sierra Leone, which includes multiparty democracy, was adopted in 1991 by the government of President Joseph Saidu Momoh, Stevens' hand-picked successor. On 23 March 1991, a rebel group known as the Revolutionary United Front led by a former Sierra Leone army officer Foday Sankoh launched an eleven-year brutal civil war in the country, in an unsuccessful attempt to overthrow the Sierra Leone government.