How about nuke Mexico city. Give them 6 months to build the wall, on their nickelpesos or nuke every other with a population of over 50,000.
Of course the problem is actually Teguchigalpa, but you have mountains of meatheads in hallomas suits of various flavors already there. No touchie dem.
Their job, as usual is to illegally enter Nicaragua and spread propaganda so the Nica-China planned canal/railroad won't make the Panama canal look like the P>O>S it really is.
Life is complicated. Make sure you have a good accountant at tax time