USA, Canada, Australia, New Zealand, and similar nations are settler-colonial nations where the indigenous people have been genocided to the point where settlers vastly outnumber them. How is decolonization going to work in this situation?
Bonus: How is a post-revolution Japan going to reconcile with the Ainu and Ryukyu people?
Individual nations building power and alliances and eventually overthrowing the government. Afterwards there might be a borderless confederation, and settlers would have to be powerless until they earn respect by being helpful.
Idk if Japan and Australia have futures.