Respuesta :
The key reason for the ending of the native civilizations of America is that slave labor worked them to death.
What is Civilization?
Civilization is regarded as a state of been developed.
Here, the country is well advanced in technology and other amenities as well as individual development.
Therefore, The key reason for the ending of the native civilizations of America is that slave labor worked them to death.
Learn more about civilization here,
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