Who were the first people to settle in the west?

The most common theory about the first settlers in Arizona is that they were Asian people who came to North America during the Ice Age, by crossing the Bering Strait when it was solid ice. They moved South and found the area now known as Arizona full of game they could hunt. As Arizona's climate became drier, the settlers changed from the early hunters to the Indins of the "modern" era. The first were probably the Cochise culture who existed around 8000BC to 500BC. The next were the Anasazi culture who arived around 2000BC.