A country of statistical extremes, landlocked Bolivia is the highest and most isolated country in South America. Bolivia, named after independence fighter Simon BOLIVAR, broke away from Spanish rule in 1825; much of its subsequent history has consisted of a series of nearly 200 coups and counter-coups. Comparatively democratic civilian rule was established in the 1980s, but leaders have faced difficult problems of deep-seated poverty, social unrest, and drug production. It has the largest proportion of indigenous people, who make up around two-thirds of the population, and is the world's largest producer of tin. Though rich in mineral and energy resources, Bolivia is one of South America's poorest countries. Wealthy urban elites, who are mostly of Spanish ancestry, have traditionally dominated political and economic life, whereas most Bolivians are low-income subsistence farmers, miners, small traders or artisans. Bolivia is one of the world's largest producers of coca, the raw material for cocaine. A crop-eradication program, though easing the flow of conditional US aid, has incensed many of Bolivia's poorest farmers for whom coca is often the only source of income.