@MontereyJack,
MJ, what does this have to do with anything. Our constitution ends at our borders. We do not have the right to enforce our constitution on any other country.
Does Mexico, or England, or Spain, or China, or North Korea have the right to enforce their constitutions on US?
What point are you trying to make?
I care that the Mexicans are happy with their constitution. If they are not, then I would encourage them to do whatever it takes to be happy with it. They can even choose to immigrate to the USA where blood runs red in the streets, due entirely to all the firearms here, if they like our constitution better.
What they can't do is enforce their laws within our border. They can try, but it won't work (nor do you really want it too, if you thought it through).