through the surplus food they controlled, collected from outlying regions and then redistributed to the general populace. Further, this elite's control of llama herds became a powerful control mechanism as llamas were essential for carrying goods between the civic centre and the periphery. These herds also came to symbolize class distinctions between the commoners and the elites. Through this control and manipulation of surplus resources, the elite's power continued to grow until about AD 950. At this time a dramatic shift in climate occurred, causing a significant drop in precipitation in the Titicaca Basin, believed by archaeologists to have been on the scale of a major drought.
As the rainfall decreased, many of the cities further away from Lake Titicaca began to tender less foodstuffs to the elites. As the surplus of food decreased, and thus the amount available to underpin their power, the control of the elites began to falter. The capital city became the last place viable place for food production due to the resiliency of the raised field method of agriculture. But, in the end, even this more productive design for food production was no match for the vagaries of the weather. Tiwanaku disappeared around AD 1000 because food production, the main source of the power elite's control, dried up. The area remained uninhabited for centuries thereafter.
Between 1438 and 1527, the Inca empire, during its last great expansion, gained control over much of what is now western Bolivia. The Incas would not maintain control of the region for long however, as the rapidly expanding Inca Empire was internally weak. As such, the impending Spanish conquest would be remarkably easy.
Colonial period
The Spanish conquest of the Inca empire began in 1524, and was mostly completed by 1533. The territory now called Bolivia was known as "Upper Peru", and was under the authority of the Viceroy of Lima. Local government came from the Audiencia de Charcas
