The document discusses how and why Mexicans migrate to the United States, with economic factors being a main driver. It notes the large difference in GDP between Mexico ($9,600) and the United States ($40,100) as well as higher rates of under-employment in Mexico (25%) compared to the US (5.5%), contributing to Mexicans seeking better economic opportunities north of the border. The document aims to explain the push and pull factors that influence migration between the two countries.