Kiribati gained its independence from the United Kingdom, becoming a sovereign state in 1979. The capital, South Tarawa, now the most populated area, consists of a number of islets, connected by a series of causeways. These comprise about half the area of Tarawa atoll. Prior to its independence, the country had exported phosphate; however, those mines are no longer viable with fisheries and export of copra driving much of the economy. Kiribati is one of the least developed countries in the world and is highly dependent on international aid for its economy.