I lived and worked in South America for almost 10-years. I could go into any major super market in Santiago or Lima and have my pick of Argentina beef, (highly over rated), Brazilian, Paraguay, or USA labeled beef.
I have never quite understood why the cattle industry has routinely resisted this? If anything, it would result in more USA-raised beef being sold...what will most people buy; ground round from the USA or from Mexico??
I don't think it's American beef growers who resist it, but some major beef sellers (slaughterhouses and some retailers) who sell lots of imported beef. Sellers of many different type products in the US fight country of origin labels. Catfish sellers is another as US growers want labeling, but those who import from Asia do not want labeling. Same story in many industries.