What is the main idea of this passage? The Four Corners is a geographical area in the United States where New Mexico, Arizona, Utah, and Colorado all meet. A drought drove the Ancestral Puebloans out of the Four Corners area, but today people live there again. The Ancestral Puebloans adapted to their local climate by building their houses, growing their food, and collecting their water in creative ways. The Ancestral Puebloans discovered ice deep in caves in the Four Corners area, which they melted for water sometimes blainly