The Ancestral Puebloans were an ancient Native American culture that flourished in the southwestern United States from about 1000 AD to 1300 AD. They were known for their impressive cliff dwellings, which were built into the sides of cliffs and mesas, and for their intricate pottery and basketry
From Wikipedia
The Ancestral Puebloans, also known as Ancestral Pueblo peoples or the Basketmaker-Pueblo culture, were an ancient Native American culture of Pueblo peoples spanning the present-day Four Corners region of the United States, comprising southeastern Utah, northeastern Arizona, northwestern New Mexico, and southwestern Colorado. They are believed to have developed, at least in part, from the Oshara tradition, which developed from the Picosa culture.