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He is probably referring to the claim that because of NAFTA, US subsidized corn drove Mexican corn farmers (mainly indigenous people) off the land, who then headed north to take jobs in the border factories and in the US.
It's a urban myth that illegal aliens residing in this U.S. make up largely of an agricultural workforce. In actuality, they make up only 5% of the illegal workforce; 20% in the construction trade where there is displacement of American workers. The rest of the industries made of illegal workers are service industries (hotel/motel, restaurant) and production work.
