Chacoan Architecture refers to the distinctive building style developed by the Chaco Canyon culture in the American Southwest between AD 900 and 1150. Characterized by large stone structures, these buildings often featured multi-story complexes, kivas (ceremonial rooms), and extensive use of masonry. The architecture was designed to accommodate large populations and served as centers for trade, politics, and religion. The most notable site is Pueblo Bonito, which showcases the advanced engineering and planning of the Chacoans. These structures were often aligned with astronomical events, indicating a deep understanding of celestial movements. The influence of Chacoan architecture can be seen in later Native American building styles.