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Edit:
Ok, his paternal great-grandfather is from Spain. Well, I guess some backflow to Spain in the 1600s is more probable than a Mongol in Spain.
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I've edited my post and added more info to it. This Y-DNA haplogroup has already been found in ancient DNA samples from North America.
It entered North America with Paleo-Eskimos (Dorset culture), who were also ancestral to the Na-Dene tribes according to recent studies.
Na-Dene tribes later migrated as far south as Northern Mexico, and even raided Central and Southern Mexico during Mexican-Indian wars:
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It is probably a Dene-Yenisean lineage, this is why it exists also in Russia/Mongolia, apart from North America:
https://en.wikipedia.org/wiki/Den%C3...eian_languages
^^^ Na-Dene languages within the Dene-Yenisean family:
His Y-DNA is likely from the Apache or Comanche (the latter aren't Dene, but could absorb it from neighbours & spread it south during their raids):
https://www.youtube.com/watch?v=qO_IkNfT3Iw#t=2h56m19s - skip to 2:56:19 to watch the part about Comanche-Mexican wars
https://en.wikipedia.org/wiki/Comanc...%93Mexico_Wars
https://en.wikipedia.org/wiki/Apache...%93Mexico_Wars
^^^ Comanche raids into Mexico:
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