In the 19th century, the United States were simply another empire among others. In 1945, at the end of the Second World War, the peak of their lightning ascent as world power became a reality. However, their expansion came up against another empire willing to extend too during the Cold war, the USSR. In 1991, when the USSR and the east block collapsed, the United States hegemony accelerated. Mexico, being a direct neighbor of the United States and partly its ally during the 20th century, suffered nonetheless the American interventions throughout the 19th and 20th centuries. The central question of this work is to understand why Mexico is so important to the United States by studying military, political, ideological and economic perspectives, notably with the implication of the supranational companies and the American financial institutions and their subsidiaries, the maquiladoras. This will bring us to think about the contrasts between the propaganda used by the defenders of liberalism and neoliberalism and the concrete results caused by it, from the independence of Mexico in 1821 to nowadays.