WA-meaning peace- is the most intrinsic Japanese moral idea. But we don't know where we've got it. We couldn't find any remarks on preceding Wa-States in Japanese oldest documents - KOJIKI and NIHONSYOKI. We could find the reason in the different social systems between Wa-States and the succeeding Yamato Dynasty. Wa-States was peaceful communal states. But, UrYamato must have been organized as a systematized troop for the conquest. Japanese society has been developed persistently, dialectically, and synthetically between these two principles under the authority of Tennou-Japanese Emperor- as a priest-king. Wa-states must have been opened to other countries and organized as democratic communities. We could now approach Wa-States periods by archeological data and DNA analyses. These data will clarify the multinational Japanese ancestry. Also this Japanese moral idea seems to me corresponding to the requirements of the coming 21st century in the technological revolution and globalization.