How could be Japan become so homogeneous? Other similar-sized islands like the Philippines archipelago, Sumatra, or even the smaller British Isles are more diverse than Japan does

chinese influence unironically

Just geographical and geopolitical reasons

>>212920864 (OP)
Japan is diverse. Yamato just conquered them under their banner

no one besides the japs wanted to migrate there

>>212920931
Maybe he's talking about the modern Japan. Those who were conquered by Yamato have been assimilated throughout the centuries, mostly

they genocided their natives I think

>>212920864 (OP)
>Japan is homogeneous

>>212920864 (OP)
Japan is at the end of the world.

>>212921114
Basically all Japs have some their DNA today though

>>212920931
saaaaar

>>212920931
>Yamato just conquered them under their banner
It's been 1800 years since then

>>212924046
Okinawa and Hokkaido are non Yamato and it's been less than 200 years

>>212920864 (OP)
>How could be Japan become so homogeneous?
Legitimate immigration system

>>212924120
okinawan and ainu are both mongoloid.
So japan is homogeneous anyway.

Everyone loves Japan and becomes Japanese.

>>212921431
The Philippines your country is hella diverse.

You have Spanish, Americans, Chinese, and even Mexicans living amongst you due to your history.

https://en.m.wikipedia.org/wiki/Mexican_settlement_in_the_Philippines

https://en.m.wikipedia.org/wiki/Spanish_Filipinos

https://en.m.wikipedia.org/wiki/Chinese_Filipinos

https://en.m.wikipedia.org/wiki/Americans_in_the_Philippines

>>212920864 (OP)
Colonisation and its consequences basically.

>>212920864 (OP)
When you're worldbuilding, only the plot-important lands get fleshed out with deep lore. The others only get a bit of flavour text

>>212920864 (OP)
It's not so homogeneous when fucking SEA women.

>>212920864 (OP)
The region excluding Hokkaido and Okinawa was unified in the 5th century, and that emperor's country has continued to rule until now.