Automobile production and ownership increased significantly
1-The modern Olympic games were established for peace and love.
2- The Noble peace Prize to those who sought for peace.
3-First Universal Peace conference in the Netherlands- Hague Tribunal
India and China Cambodia is a developing country and Japan will not be allowed to be a superpower due to the world closely monitoring them after WWII
I think it might be the cutting back on military spending because of the economy.