I believe the trading relationship between Mexico, Canada, and United states would be the one that most impacted.
The existence of NAFTA allows better movement of Factors of Production between the three nations. Dissolving NAFTA would most likely increase the import/export tax between this nations and could also lead to the dissolvents of many jobs.
It would best describe them as politically unstable
The person with better evidence and reasoning
The main way in which the Seven Years War did this was because although the war technically ended in a British Victory, the British suffered heavy losses--meaning that the colonists saw that the British were at least somewhat militarily vulnerable.