Ecotopia was the name given by the author Callenbach to the region of Megalopolis.
National identity and unity played a role as it provided common values that were necessary in unifying the empire. The group identity of the Romans was critical in unifying them from city states to an empire and also in pulling together other diverse societies to form an empire
The League of Nations was created after the first World War to provide a forum for resolving international disputes between other nations.