There can be no peace in the world so long as a large proportion of the population lack the necessities of life and believe that a change of the political and economic system will make them available. World peace must be based on world plenty.
Though the general principles of statecraft have survived the rise and fall of empires, every increase in knowledge has brought about changes in the political, economic, and social structure.
We are now physically, politically, and economically one world and nations so interdependent that the absolute national sovereignty of nations is no longer possible.
When the Industrial Revolution of the nineteenth century brought a rapid increase in wealth, the demand of workers for a fair share of the wealth they were creating was conceded only after riots and strikes.