The United States is better at producing corn than Mexico, GM or not. One effect of NAFTA was to eliminate thousands of Mexican small farmers. Corn is a major staple of the Mexican diet. Cheaper U.S. corn forced local corn out of the market. NAFTA damaged American manufacturing and Mexican agriculture. Over 30 years ago, Ross Perot was greatly criticized for opposing NAFTA. It turns out his assessment was right.
One effect of NAFTA was to eliminate thousands of Mexican small farmers. Corn is a major staple of the Mexican diet.
The issue is more a shortage from drought that overcomes the gmo issue this year?
If memory serves, seems like NAFTA was a Clintoon era thing so not surprised the result would be disastrous. Perot was correct on many issues of the day yet was nothing but a spoiler in the big scheme of things.