And we know for a fact that there was no sort of Mexican generational citizenship, a la England, Italy or Israel, that could potentially have gummed up the works, as some have attempted to claim?
If so, there can be no doubt, Mitt Romney was a natural born citizen for Constitutional purposes, at the time of his birth.
Yes, we do. Mexico law was influenced Spanish rule & French rule. They were very homegeneous people and they didn't take to mixing blood, let alone adopting those not born of their blood as one of their own. They never adopted the feudal law of "jus soli" and to this day, they have one of the strictist immigration laws on the books.