According to Keeley, among the indigenous peoples of the Americas, only 13% did not engage in wars with their neighbors at least once per year. The natives' pre-Columbian ancient practice of using human scalps as trophies is well documented. Iroquois routinely slowly tortured to death captured enemy warriors (see Captives in American Indian Wars for details). In some regions of the American Southwest, the violent destruction of prehistoric settlements is well documented and during some periods was even common. For example, the large pueblo at Sand Canyon in Colorado, although protected by a defensive wall, was almost entirely burned, artifacts in the rooms had been deliberately smashed, and bodies of some victims were left lying on the floors. After this catastrophe in the late thirteenth century, the pueblo was never reoccupied.
For example, at Crow Creek in South Dakota, archaeologists found a mass grave containing the remains of more than 500 men, women, and children who had been slaughtered, scalped, and mutilated during an attack on their village a century and a half before Columbus's arrival (ca. 1325 AD). The Crow Creek massacre seems to have occurred just when the village's fortifications were being rebuilt. All the houses were burned, and most of the inhabitants were murdered. This death toll represented more than 60% of the village's population, estimated from the number of houses to have been about 800. The survivors appear to have been primarily young women, as their skeletons are underrepresented among the bones; if so, they were probably taken away as captives. Certainly, the site was deserted for some time after the attack because the bodies evidently remained exposed to scavenging animals for a few weeks before burial. In other words, this whole village was annihilated in a single attack and never reoccupied.[5]
