Comprising the eastern half of the Samoan islands, American Samoa sits on the edge of Polynesia in the South Pacific Ocean. Although Christianity, introduced in the 19th century, has taken a very firm hold – Samoa is known as the Bible belt of the Pacific – the traditional and conservative fa'a Samoa (Samoan way of life) still dominates the islands' culture. At its base is the extended family, the aiga, while traditional chiefs, or matai, retain their central role in government. Samoa having come under control of the USA in 1900, life there remained largely unchanged until a US-led drive for modernization in the 1960s. Along with better healthcare and industrial development, fa'a Amerika also meant unemployment, pollution, and rising petty crime fueled by alcohol. Tuna processed by Pago Pago's canneries represent 95% of American Samoa's exports. Efforts to diversify include the development of other light industries and tourism.