No colonial power really managed to strike this balance OTL, at least for large and heavily populated territories, especially those with a pre-existing national identity like Korea. That's not say it's impossible... but it suggests it's unlikely, and there's no real OTL model to draw from.
Just shooting in the dark here; any way Japan could've done something with Korea along the lines of Austria-Hungary's dual monarchy thing?
Austria-Hungary's dual monarchy didn't occur in a vacuum, it was part of a complicated historical process and interplay between Austria and Hungary that has no clear parallel in the relations of Korea and Japan. It was also a much longer subject-vassal relationship than that between Imperial Japan and Korea (which could probably be most forgivingly dated to 1876 in the case of Japan-Korea versus the 16th century for Austria-Hungary).
No the Japanese regarded the Koreans as racial inferiors combined with the domination of Korea by a Japanese elite and a Korean desire for Independence makes this impossible.
There no way for Japan to retain Taiwan or Korea without denying both countries' rights.
I am aware. That was kind of my point. Japan isn't going to make a dual monarchy with Korea or China because a dual monarchy would imply a bilateral relationship they weren't willing to assume with others. Japan could have maintained a puppet Kingdom in Korea (as they did do in parts of China) rather than direct annexation as they did in 1910 but that is very different from a dual monarchy.
Won't work, unless the Japanese have the wisdom not to send over settlers.
Taiwan is still going to require an iron fist to rule given the Japanese view of the Taiwanese and Taiwanese desires.
Japanese colonies held a position similar to Europeans in their African colonies.
Any increase in Japanese settlement is going to be offset by a higher Korean and Taiwanese birthrate compared to otl's.
Simple, by giving Japan fairer deals via the like of the Washington Naval Treaty and accepting the Racial Equality Proposal (though that part would require not having Wilson as POTUS).
I think you're underestimating the degree to which Taiwan had already been integrated into Japan OTL. You also are comparing two very different situations. Japan and its colonies are nothing like Europe and their colonies. Japanese leaders in the interwar period were expecting the Japanese population to be 150 million by 1950 (the exact phrasing was something like "150 million by midcentury"). If you're able to find a way to make that correct (which is a big if), theres absolutely more than enough people for the Japanese to send out to colonize a place like Taiwan, a place that had a population of only 4.5 million by 1930. Also, Taiwan is fairly close in proximity to Japan and had largely been integrated successfully OTL as I said before, which makes it far easier for an authoritarian regime to ship off a few million colonists if they feel it necessary. I just don't see how you can say that Taiwan wouldn't have been able to be colonized successfully.
