Around a year ago, I read a history of Japan. It was so convoluted that I am not sure I know more than I did before reading it.
Well I do remember that the first Japanese came from Korea. Wait, I forgot about the Ainu.
Ainu. I’m aware of them from being stationed on Hokkaido.
They also moved north along the sea lanes from Taiwan and the Ryukyu Islands (Okinawa). Geologically, Japan is a young country.