Bolivia is a landlocked country in central South America. Despite the isolating geography due to the Andes mountain range, the diverse country is home to many different groups of people and their own histories. The Tiwanaku people, who settled by Lake Titicaca around 600 CE, were the first civilization in the Bolivian highlands. They descended from the Aymara and Quechua people, who now make up a total of fifty-five percent of the country’s current population. Later, the Inca people inhabited the land, and their civilization was at its highest around 500 A.D. They were later defeated when the Spanish conquered the area in 1531. They brought much of their culture with them including their religion. As a result, the official religion of Bolivia is Roman Catholicism. Although Spanish culture still plays an important part in the country today, two-thirds of the population is still indigenous, while only fifteen percent is white. Yet, the country still faces problems establishing the role of indigenous people in society, many of which are the result of disagreements over expansion and development. Despite such disagreements, the country has South America's fastest growing economy.