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I debated whether to post this study. I decided not to because I'm really not ready for another confrontation, but whatever...
I disagree with Razib Khan's take on this with regard to the Conversos, and think he totally mis-characterizes a study done a few years ago actually investigating these claims of "converso" ancestry.
See:
https://www.gnxp.com/WordPress/2018/...medium=twitter
https://www.theatlantic.com/magazine...n-jews/378454/
I am not convinced that this additional "eastern Mediterranean" in New World Latinos is necessarily "Sephardic" in origin. There's nothing particularly distinctive about Sephardic genetics, in contrast to Ashkenazi genetics, so it's very difficult to pinpoint it. More "eastern Mediterranean", whatever they actually mean by that, didn't necessarily enter the Spanish New World genome through Jews. It sounds to me like typical sloppy Hellenthal thinking. As for Khan, when he was at FTDNA he made some snap judgments about that as well, and maybe he feels the need to defend it.
The reality is, however, that the majority of the first Spanish settlers in the New World came from Extremadura and surrounding areas. This couple of percent "extra" and more "eastern" ancestry could be the result of other migrations into Extremadura as well, and then onto the New World, not necessarily only by the Sephardics.
Not that I deny that some Sephardim might not have fled to the New World hoping to put distance between themselves and the Spanish Inquisition.
This leads me to the careful investigation of the claims of "Hispano" Americans in the southwest about so called "Sephardic" practices which can be found at my second link. If you read the article carefully, it's clear that some of these claims are nonsense. Many of the practices detailed by these supposed descendants of conversos are Ashkenazi in origin, and no Sephardim would have practiced them or passed on knowledge of them. Others were practiced by people who had converted to a Protestant sect which practiced certain "Jewish" customs. It's no coincidence that a lot of those claiming such ancestry have this kind of Protestantism in their history. In addition, it is absolutely true that a lot of Hispanos have attempted to distance themselves from Mexicans, on the grounds that they have no Amerindian ancestry. Jewish ancestry is acceptable, but not Amerindian ancestry. It reminds me of the groups like the Melungeons, who claimed for years that they had Jewish and Amerindian ancestry, anything rather than acknowledge the reality, which was that they were a mix of "Anglo" and "black".
That doesn't mean that some of the claims aren't valid, as I said. It just means it isn't as widespread or extensive as is claimed.
Non si fa il proprio dovere perchè qualcuno ci dica grazie, lo si fa per principio, per se stessi, per la propria dignità. Oriana Fallaci