For Mexico, its largest trading partner is the United States, being the recipient for 78% of total Mexican exports (2012). For Brazil, China is the largest trading partner, receiving 17% of total Mexico is the United States' top trade partner. At least for the moment. This, to my knowledge, is a first. Mexico traditionally ranks third among U.S. trade partners, behind China and Canada. The United States is the 3rd largest export economy in the world and the 7th most complex economy according to the Economic Complexity Index (ECI). In 2017, the United States exported $1.25T and imported $2.16T, resulting in a negative trade balance of $910B. In 2017 the GDP of the United States was $19.4T and its GDP per capita was $59.5k.