I guess the word you are looking for is "cultural assimilation". 内鮮一体 is the specific case of Japan and Korea.
The Japanese were fresh out of their own industrial revolution so had plenty of experience to do the same thing in Korea. The legacy of that is that Korean and Japanese societies have a lot in common eg Chaebol and Keiretsu. Following the war Japan sheltered people persecuted by the ROK dictatorship (eg Kim Dae-jung, Lee Byung-chul)
> I think part of the hostility from either of the countries is caused by only seeing part of the reality.
It's tribal. East Asian People are racist against each other and each other's countries, but East Asian Persons get on just fine.
The Japanese were fresh out of their own industrial revolution so had plenty of experience to do the same thing in Korea. The legacy of that is that Korean and Japanese societies have a lot in common eg Chaebol and Keiretsu. Following the war Japan sheltered people persecuted by the ROK dictatorship (eg Kim Dae-jung, Lee Byung-chul)
> I think part of the hostility from either of the countries is caused by only seeing part of the reality.
It's tribal. East Asian People are racist against each other and each other's countries, but East Asian Persons get on just fine.