Article: “Japan’s forgotten indigenous people”

In the Japanese school curriculum (set by the central government in Tokyo) there is very little time and space spent on the Ainu, an indigenous group that has almost been completely assimilated and there are maybe less than 100 Ainu language speakers left.

What are the reasons for the “bubbles” in situations like this where an indigenous group culture and history is almost wiped out by a more powerful group?

What are the current “bubbles” regarding knowledge of the Ainu? How important is it if knowledge is acquired in bubbles?