> every group of humans is further divisible into smaller groups
Indeed, the Ryukyuans were divided into a whole kingdom with its own head of state and foreign policy, which didn’t become “part of Japan” until the late 19th century. Hokkaido was “acquired” in the 1860s, along with its indigenous people. The dates and situations closely parallel Hawaii and Alaska. To say that they are Japanese because the Japanese government decided so is to ignore historical facts in favor of ideology.
Indeed, the Ryukyuans were divided into a whole kingdom with its own head of state and foreign policy, which didn’t become “part of Japan” until the late 19th century. Hokkaido was “acquired” in the 1860s, along with its indigenous people. The dates and situations closely parallel Hawaii and Alaska. To say that they are Japanese because the Japanese government decided so is to ignore historical facts in favor of ideology.