Summary: The research aims to characterize the changes that records the Mexican economy and the agricultural sector in particular from the recent economic reforms implemented in Mexico, deregulation, privatization, trade liberalization. This is a historical research structural characteristics and longitudinal documentary. It is developed within the context and role that has been given to the agricultural sector in the process of economic development in the past 50 years, particularizando in the decades
1980 and 1990, which has been incorporated into the primary sector to the dynamics of trade liberalization international agricultural goods as a way to promote their development. The reforms have been consolidated with the opening of trade, with the incorporation in the World Trade Organization and regional integration in the Free Trade Agreement of North America, together with Canada and the United States, which has facilitated and increased flows trade and foreign direct investment. The investigation has found that the opening of the commercial agricultural sector in Mexico, has fostered the growth of foreign trade in commodities, with a trade deficit situation. This trade has been concentrated in the area of trade agreement, registering a change in the pattern of trade in agricultural goods, agricultural produce tradable goods, vegetables and plants, increases significantly, concentrated in the north of the country, exacerbating the Dual Mexican agricultural sector. The production of basic grains is stagnating and oleginosas decreases. The benefits of this trade liberalization have not been extended to the rest of the sector, which has prevented this trade liberalization is expressed as a reduction of poverty and migration of the rural population towards the big cities and abroad.