I think the key to the US-Mexico relationship is immigration and for President Trump to stop talking and tweeting about having Mexico pay for the border wall. A wall is not needed but Trump and Mexico do need to cooperate on border protection. Trump also needs to try to understand the real issue, which is not only Mexican’s crossing the US-Mexico border, but people fleeing violence from other areas of Latin America.
One other key is NAFTA (North American Free Trade Agreement). Many experts agree that NAFTA, immigration and criminality are interconnected. If Trump’s actions were weaken for NAFTA, then it would result in less job opportunities.