The Ancestral Puebloans, also known as the Anasazi, were a Native American culture that thrived in the Four Corners region of the United States from approximately 100 AD to 1300 AD. They are renowned for their remarkable cliff dwellings and intricate pottery, which reflect their advanced agricultural practices and rich spiritual beliefs. This culture is significant in understanding the development of complex societies in North America, as they established extensive trade networks and created impressive architectural achievements in arid environments.