In this article it does a revision of international art state and national one related with economic integrations. In this revision the author divides the theoretical effects of integrations in static’s and dynamics and does the explanation of meaning of each one. The article does a deep explanation of international policy issues with respect to agricultural sector and explain the conceptual differences between developed and developing countries in the way of understand this sector. In the case of United States this sector is considered as “National Priority” and in countries like Colombia is one more sector. In the article, the lector will find an analysis of the Farm Bill and The Economic Union Agrarian System and its implications in the agricultural sector in Colombia forward the LTC with The United States and in the future a LTC with UE. Topics like agricultural subsidies and dumping are treated and using dates of the Agrarian Ministry of Colombia those are compared with production costs and international prices for several products as a way of to know the differences among sectors and products. Finally as an example of the effects of a treated is tacked the TLCAN because there are some similitude with the TLC between Colombia and United States and the TLCAN at least in the agricultural sector. In this part is showed the positive effects in Mexico post-treated and the negative one as a way of predict what could happen in our sector after the treated.