The document discusses the conquest of Mexico by Spanish troops led by Cortes. It describes the epic battle between the Spanish and Mexica defenders for control of Tenochitian. It also outlines the different zones of trade and exchange that existed in Mexico prior to the conquest, including a core area, affluent production zones, and resource extraction zones. Additionally, it examines the campaign of the Mexica leader Don Gonzalo MatatzinMoctezuma, dividing it into conquering areas to the southwest of Tepexi and then turning northeast. The document concludes by comparing a map of Cuauhtinchan to that of Quauhquechallan, noting they were both powerful Nahua city-states located