
The article reviews NAFTA's history since 1994 and argues that cheap US commodity corn has harmed Mexican smallholder maize farmers. It links these effects to migration pressures and notes that trade between the US and Mexico has roughly tripled.
The analysis is background on the NAFTA debate and does not report a new policy change. It reinforces the political risk to US corn exports to Mexico if renegotiation tightens.
After 439 past neutral policy events, Corn moved a median +0.1% over 5 sessions (51% higher; middle half -1.3% to +1.2%), and +1.1% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.