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This is when the first Inca traveled to Cuzco valley to start the civilization.
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When The Inca civilization became an empire.
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this is when the new emperor was elected into the empire
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Just five years after the new emperor is in office Machu pichu is started which is a citadel and is later abandoned
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This is when, sadly, the Inca died after exposure to a disease brought by Europeans called smallpox.