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There are many different theories for explantion the causes of expansion relation of countries. One of these theories is integration theory, which has been made upon European countries experiments. After their vast achievments in their economic and technical cooperations, many other countries in the third world payed attention to this kind of relation, as a strategy for development. Many various regional grouping have been introduced in this way, that cannot gain such a thing in Europe. However with respect to developments in European Countries in the process of integration, theories of integration have been changed for adjusting to the realities.