Liberal idealism in international politics did not re-emerge, after the devastation of the Second World War, until the 1970s. Rapid advances in technology, the growth of organisations like the European Community, and the impact of events like the 1973 oil crisis pointed towards evidence of growing interdependence between states.
At the same time liberal literature made significant inroads into the rigid inside/outside, domestic/international distinctions characteristic of realism, with the emergence of trans-national relations and world society.
Modern interdependency theory uses free trade and the removal of barriers to commerce as proof to their claims. "The rise of regional economic integration in Europe was inspired by the belief that the likelihood of conflict between states would be reduced by creating a common interest in trade and economic collaboration amongst members of the same geographical region."
European powers, instead of resolving their differences militarily, would cooperate within a commonly agreed economic and political framework for their mutual benefit. Eventually cooperation between states would increase and broaden as mutual advantages could be gained. Membership of the
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