Anarchic international system realism: one states gain is another states loss, states prone to conflict. League of nations and collective security: threat of punishment wasn"t enough. Interdependence (especially economic: positive sum, functionalism, rules and norms. To maintain international peace and security, and to that end: to take effective collective measures for the prevention and removal of threats to the peace ; To develop friendly relations among nations based on respect for the principle of equal rights and self-determination of peoples ; To achieve international co-operation in solving international problems of an economic, social, cultural, or humanitarian character ; and. To be a centre for harmonizing actions of nations in the attainment of these common ends. New global risks and global governance: we recognize that we can no longer meet the challenges of the 21st century economy with the 20th century approaches.