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It isn’t.
https://en.wikipedia.org/wiki/Josef_Mengele#In_South_America
See that an raise you: https://en.m.wikipedia.org/wiki/Operation_Paperclip
Yes, I’m aware. That doesn’t mean it was some sort of American secret operation to put Mengele in Argentina as a distraction. He escaped there, as did other Nazis. Hence the “Argentina Nazi thing” as you put it.