The sustained growth of the population and its interaction with an ideology that spread into the region from the North around 1000 A.D., prompted a dramatic shift among the Llolleo way of life, prompting these people to increasingly focus on corn farming, an economic activity that demanded a much more sedentary way of life. The production of corn also required communal activities such as irrigation works and greater control over the territory.
Over time, these changes led to the emergence of a new cultural tradition, the Aconcagua, though as in previous times there was a continued reliance on hunting wild animals to provide the required animal protein, as the domestication of camelids only came to Central Chile with the Inca expansion into the territory. Aconcagua settlements were distributed in the valleys, along the coast and in the mountains of what is now Central Chile, in places such as La Dehesa, in present-day Santiago, El Manzano in the Maipo Valley, and near the coastal lagoon of Matanza, in Region V.