Ancestors of Japanese and Native Americans
The history of Japan started 16,500 years ago when the so-called Jomon era began. This Neolithic age of Japan (featured by development of various earthenware vessel use, which is unique in the world) ended about 2,500 years ago when the so-called Yayoi era began with introduction of rice farming.
The basis of the Japanese people or the Japanese race was formed in this Jomon era. And from analyses of genes and DNA, it is believed that most of the Jomon people came from eastern Siberia across the strait between the Asian Continent and Hokkaido, the most northern major island of the Japanese archipelago. However, there is also a theory that some people came to Japan in the Jomon era from the south over the western Pacific from areas around Indonesia.
Although Japan is near Korea and China, there are no proof that a great number of people once migrated from Korea or China to Japan to share a majority of residents in Japan especially in the Jomon era. However, along with introduction of rice farming in the subsequent Yayoi era, which continued till the third century, and along with introduction of Buddhism or due to wars and political turmoils in the Korean Peninsula in the subsequent period when the imperial authority was established in Japan, some Koreans moved to Japan to be absorbed by native Japanese.
On the other hand, it is believed that it was about 15,000 years ago that some Asian tribes migrated from eastern Siberia to North America. Based on some DNA analysis, it is believed that there was an original group of ancient eastern Siberia tribes from which ancestors of the Japanese or the Jomon people migrated to the Japanese archipelago and also ancestors of Native Americans migrated to North America almost at the same era of 16,500 years to 15,000 years ago,
In this context, the Japanese are closer to Native Americans than Chinese.
However, I think that it will be proved someday that Judaists or Israelis are closer to ancient Sumerians than contemporary Arabs in terms of the origin of their ancestors.
And, the largest enigma for the mankind is from where Sumerians came to Mesopotamia 5,500 years ago, since Abraham was born around the Sumerian city Ur about 4,000 years ago, although the Great Pyramids of Giza were built 4,500 years ago.
Anyway, we have to respect our ancestors like Judaists respect Abraham and Moses.
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Mar 12:26 And as touching the dead, that they rise: have ye not read in the book of Moses, how in the bush God spake unto him, saying, I am the God of Abraham, and the God of Isaac, and the God of Jacob?
Mar 12:27 He is not the God of the dead, but the God of the living: ye therefore do greatly err.