'Racial homogeneity' is not a thing in biology Furthermore, up until 1869 Hokkaido was a separate kingdom peopled by the Ainu - Japan has a long history of exc

'Racial homogeneity' is not a thing in biology Furthermore, up until 1869 Hokkaido was a separate kingdom peopled by the Ainu - Japan has a long history of exchanging people with Korea. It's not some fabled walled-off kingdom, it's a regular country full of regular people