Had Leonardo Castro been born two decades earlier, he would almost certainly have migrated north to the US in search of better opportunities, he says. Instead, the 31-year-old was able to build a career as an aircraft test engineer in his native Mexicali.

Mr Castro works for Honeywell Aerospace, a subsidiary of the US industrial conglomerate, as part of a 350-strong testing and development team at its Mexicali research centre.

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