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Throughout the Inca Empire's history, each Sapa Inca worked to expand the territory of the empire. When Pachacuti, the 9th Sapa Inca ruled, he expanded the Empire to northern Peru. At this point, Pachacuti sent his son Tupac Inca Yupanqui to invade and conquer the territory of present-day Ecuador. News of the expansion of the Inca reached the different tribes and nations of Ecuador. As a defense against the Inca, the Andean chiefdoms formed alliances with each other.