The Inca’s were a powerful civilization that dominated the western part of the South American continent prior to the disastrous arrival of European colonials. Many legends surround the origins of this incredible society. In this article, scientists have looked at the DNA of indigenous peoples to determine where the Inca’s came from. The results are sure to ignite further debate.
Inca Origins Investigated Via DNA

I have seen the linked article and seems to be not correct, there is a bias in the investigation in my opinion, speaking as a native around the lake Titicaca.
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Thank you for your reply.
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