Somehow I feel the lacking of "harmony and equitable sharing of prosperity" may be the undoing of great hope for unity in diversity. Nations have policies based on one extreme such as integration (ie. assimilation eg. France's way of life) and another extreme such as 'multiculturalism' (ie. thousands islands nations eg. Australia), and many flavours in between. Stability of policies seems to depending very much on 'sharing of prosperity' (land, education, wealth, resources, opportunity, equality, ...).

Perhaps because human are opportunistic animals, we will never achieve 'altruistic' goals!