i dont believe that there is any way that the countries of the world can achieve world peace with out a powerful single government holding it together. For example, the former country of Yugoslavia constisted of many ethnic groups, the serbians the bosnians, the muslims, and croations lived together in peace for many years under communist government which acted as a puppet controled by the USSR. Once communism fell in Yugoslavia the ethnic groups began to fight and civil war broke out and acts genocide were committed by the serbians. Had the yugoslavians been untied by a powerful central government many lives would ave been saved. This shows what happen when people of different ethnic groups live together without some time of government above it. If the world is not controlled by a single government the world peace will never be achieve, not only will world peace not be achieved but the people of the world will exterminate their own species.