Japan is not the Heian period, Edo period only, as for the Jomon period, peace was longer.
It is one of whole world's being matchless that continues peace society over hundreds of years.
Saying isn't necessary that it is possible to do long-range crossing and that peace society can be realized and being able to maintain are not an effort by the specific person and the Article 9 of the Japanese Constitution.
It was born from the natural providence and the social mechanism, and the history is completely different from the change of Chinese dynasty by fate and the various countries of the aspect of the war and peace in this world calms down and is disordered and to repeat it.
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