That’s a massive overestimation. I was looking it up for some reason not that long ago. It was only like 16-17 million Asian males are descended from one man believed but unable to be confirmed to be Genghis Khan.
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Only 16-17 million . That's pocket change.
Eh when you started back in the 1200’s, rape was used as a military tactic, and in comparison to the entire population of the geographic area they’re using it’s like eh. Yes this common ancestor left quite a lineage. There are just so many generations in that time period to be fruitful and multiply.