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The Aztecs did not have the same calendar as us so the year when they started doing heart extractions is not very clear but it is estimated to have originated during the 13th century
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The sacrificial rituals were a prevalent religious practice throughout ancient societies. Sacrifices served as acts of power and intimidation as well as demonstrations of devotion and gratitude.
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There wasn't many changes to the ritual as their civilization wasn't around for a long time, they would sacrifice multiple people at the same time as part of their change as oppose to just sacrificing one person at a time.
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The purpose of their ritual did not change throughout the existence of the Aztecs
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The blade that is used for the extraction is an important symbol in the culture and sacrifice as it is a main part of the ritual.
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The heart is another important symbol as it represents a sacrifice to the gods and higher beings in Aztec culture and it served as a sense of piece for their civilization