Focusing on the Lake Titicaca Basin in the Andes mountains, a team of anthropologists led by UC Davis anthropology graduate student Luis Flores-Blanco, found through analysis of 1,179 projectile points that the rise of archery technology dates to around 5,000 years ago.

Violence during climatic change has evidence in history. University of California, Davis, researchers said they have have found a pattern of increased violence during climatic change in the south central Andes between A.D. 470 and 1500. During that time, which includes the Medieval Climatic Anomaly (ca. A.D. 900-1250), temperatures rose, drought occurred, and the first states of the Andes collapsed.