The Inca Empire Established

In 1438, Pachacuti Inca Yupanqui ascended as the ninth Sapa Inca after defeating the Chanca people near Cusco. He transformed the regional Kingdom of Cusco into Tawantinsuyu, an expansionist state. Within three generations, the empire extended approximately 4,000 kilometers along western South America, from modern Ecuador to central Chile, covering an estimated 2 million square kilometers. Pachacuti reorganized administration, implemented the mit'a labor system, and is credited with commissioning Machu Picchu. At its peak, the empire governed an estimated 12 million people across diverse geographic zones.