I hate to nitpick, but the Han Chinese didn't "invade Japan and decimate the Ainu". I know you're referring to the Jomon-Yayoi interactions in the Iron Age. But the ethnic identity of the Yayoi isn't certain, and more importantly, there was no "decimation" of the Jomon/Ainu.
Quite the opposite, it was a period of peaceful interracial marriages, which skewed towards incoming Yayoi women marrying local Jomon men. This is demonstratable by the fact that the most common Y-DNA haplogroup among Japanese males in the Kanto plain region is the indigenous Jomon haplogroup, haplogroup D. In northern Japan, where the Ainu live, over 75% of Japanese males carry this haplogroup, despite having more than 90% Japanese maternal haplogroups.
Jomon mitochondrial lineages, and thus the maternal contribution from Jomon females, are quite rare in Japanese people. Also, Ainu are largely descended from Japanese females, but have very small paternal Japanese ancestry.
Nevermind the fact that the indigenous Jomon appear to have been the dominant class in the Yayoi period. All Japanese imperial family males carry the Jomon haplogroup D, it is therefore easy to conclude that Japanese emperors, dating back to the 1st millennium AD, were descended from Jomon males.
Y-DNA of Japanese imperial family and Samurai clans:
"Emperor Higashiyama (1675-1710) belonged to Y-DNA haplogroup D1a2a1a2 (D-IMS-JST055457/CTS107), which is a subclade of haplogroup D1a2a which is prominent among the Jōmon people that make up about 30% of modern Japanese ancestry. This was determined with a test on an oral mucosa sample taken from his paternal descendants.[74][75]"
Anthropologist C. Loring Brace had predicted this 30 years ago:
So there's really no comparison between Japan and the USA. Although there was significant migration from mainland East Asia to Japan, these migrants didn't "conquer" the Jomon/Ainu. If anything, it was kind of the other way around.
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timeasmymeasure
no subject
Date: 2022-02-10 09:14 pm (UTC)Quite the opposite, it was a period of peaceful interracial marriages, which skewed towards incoming Yayoi women marrying local Jomon men. This is demonstratable by the fact that the most common Y-DNA haplogroup among Japanese males in the Kanto plain region is the indigenous Jomon haplogroup, haplogroup D. In northern Japan, where the Ainu live, over 75% of Japanese males carry this haplogroup, despite having more than 90% Japanese maternal haplogroups.
Jomon mitochondrial lineages, and thus the maternal contribution from Jomon females, are quite rare in Japanese people. Also, Ainu are largely descended from Japanese females, but have very small paternal Japanese ancestry.
Nevermind the fact that the indigenous Jomon appear to have been the dominant class in the Yayoi period. All Japanese imperial family males carry the Jomon haplogroup D, it is therefore easy to conclude that Japanese emperors, dating back to the 1st millennium AD, were descended from Jomon males.
Y-DNA of Japanese imperial family and Samurai clans:
https://www.familytreedna.com/public/SamuraiDNA?iframe=yresults
https://en.m.wikipedia.org/wiki/List_of_haplogroups_of_historic_people
"Emperor Higashiyama (1675-1710) belonged to Y-DNA haplogroup D1a2a1a2 (D-IMS-JST055457/CTS107), which is a subclade of haplogroup D1a2a which is prominent among the Jōmon people that make up about 30% of modern Japanese ancestry. This was determined with a test on an oral mucosa sample taken from his paternal descendants.[74][75]"
Anthropologist C. Loring Brace had predicted this 30 years ago:
https://www.science-frontiers.com/sf065/sf065a01.htm
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So there's really no comparison between Japan and the USA. Although there was significant migration from mainland East Asia to Japan, these migrants didn't "conquer" the Jomon/Ainu. If anything, it was kind of the other way around.