There are numerous mountains in Japan and they were an obstacle towards unifying the country. Since many parts of Japan waged wars against others, it was difficult to fight in other people's regions since they had the mountains to their advantage so there was a difficulty in uniting every part of Japan through wars, like it was done in numerous other countries.
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Folowing World War II, The world's leaders promoted peace and reduced poverty by starting and participating in the United Nations. United Nations promoted cooperation between nations, instead of aggression. It is an intergovernmental organization created to keep international peace and security, develop friendly relations among nations, achieve international co-operation and be a centre for harmonizing the actions of nations.