By accident I came across this site which, among other things, looks back at German and Japanese colonial in Saipan.
Actually quite, quite interesting. Stuff like this:
“The people now remember the Japanese times as being prosperous. Nonetheless, at the end of World War II there was a lot of resentment, because there had been a real social structure. It was the Japanese, then the Okinawans, the Koreans, and the Chamorros and Carolinians. The locals had a collective name. They were tomin, islanders.’ It was kind of a derogatory term that the Japanese used.
“The islanders resented that. They resented that they were minorities in their own land. They resented that they could only rise so high within the South Seas government organization. They were pretty much there as laborers for the Japanese, and you had a few of the people from prominent families that were trained to act as intermediaries between the Japanese and masses.”
Read the rest on your own.