Final answer:
The Inca named their capital city Cusco as the 'navel of the world' because of its central location and religious significance.
Step-by-step explanation:
The Inca named their capital city Cusco as the 'navel of the world' due to its central location in their empire and its religious significance. It represented the center of the Inca universe, connecting the heavens, the earth, and the underworld. This naming was a reflection of the Inca's belief that Cusco held immense spiritual and political power.
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