according to wikipedia regarding mexican auto industry:  The automotive sector accounts for 17.6% of Mexico's manufacturing sector.[2] Mexico is the second largest automobile manufacturing nation in the Western Hemisphere, after the United States, having produced 4 million vehicles in 2017.[3] The industry produces technologically complex components and engages in research and development.[4] The "Big Three" (General Motors, Ford and Chrysler) have been operating in Mexico since the 1930s, while Volkswagen and Nissan built their plants in the 1960s.[5] In Puebla alone, 70 industrial part-makers cluster around Volkswagen.[4] In the 2010s, expansion of the sector was surging. In 2014, more than $10 billion in investment was committed in the first few months of the year. Kia Motors in August 2014 announced plans for a $1 billion factory in Nuevo León. At the time, Mercedes-Benz and Nissan were already building a $1.4 billion plant near Aguascalientes, while BMW was planning a $1-billion assembly plant in San Luis Potosí. Additionally, Audi began building a $1.3 billion factory near Puebla in 2013.[6] Of the Mexican car exports to the US, most are carried by rail, and some by sea.[7]  at a bare minimum then, we're talking 10+ billion dollars taking up almost a 5th of their entire industry. not sure what that looks like on the US side but someone can probably do the numbers