The Chacoans were an ancient Native American culture that thrived in the Chaco Canyon region of present-day New Mexico from around AD 900 to 1150. They are known for their impressive architectural achievements, including large multi-story buildings made of stone and adobe, which served as ceremonial and residential spaces. The Chacoans developed a complex society with extensive trade networks and agricultural practices. Chaco Canyon was a major center for the Ancestral Puebloans, who built a series of great houses and roads connecting various communities. The Chacoans also engaged in astronomical observations, aligning their structures with celestial events. Their influence extended across the southwestern United States, impacting later cultures.