> They have changed completely as a society at least twice before on their own. Can you name any events? I would be hard pressed to find any where anything hap

> They have changed completely as a society at least twice before on their own. Can you name any events? I would be hard pressed to find any where anything happened "on their own" (and that is not specific to Japan). No country is completely isolated, not even Japan during Sakoku. For the to last major ones, I wouldn't call "On their own" an entirely accurate description: Being on the losing side of WWII and under occupation, and negotiating at gunpoint a treaty with US to end the self-isolation of Japan.