From a stock of Mongolian, Chinese, Korean, and perhaps also Malay settlers, the country has had several thousand years to develop a solidly unified ethnicity.
Japanese people are still from 4 separate ethnic groups.
mnli hypothesis: Japanese people are still from 4 separate ethnic groups. premise: From a stock of Mongolian, Chinese, Korean, and perhaps also Malay settlers, the country has had several thousand years to develop a solidly unified ethnicity.