Let us assume [Handwavium] a Japanese Philippines around the time of WW 1. Now in Japanese Karafuto the Japanese pushed any Russians Settlers [Few] out of the territory and treated the rest like they did the Ainu. [most were] In Taiwan they tried Forced Assimilation, thousands of Settlers, Japanese schools, Renaming the Natives with Japanese Names, etc. However the Ainu policy was well established, and on Taiwan half the Natives were ethnic Chinese [ie Asian]. In the Philippines the Japanese are dealing with the natives [nesian], long term Settlers [Spanish], European Business, Chinese Merchants, Native-sized Japanese [pre 1640 settlers]. The northern Half is solidly Christian, the south solidly Muslim. And now this whole mess of Gajim is part of the Japanese Empire. In the US despite being -enslaved -segregated- discriminated - Blacks have given us Gospel - Ragtime - Jazz - Scat- R&B - Rap - & Hip Hop. ?So what effects will all these Gajim have on Japanese Society & Culture?