“George could have become a US citizen on reaching age of majority and executing naturalization procedures. “
Sorry, but birth to US citizen parents, even on foreign soil, makes George Romney a “born” US citizen with no need to naturalize. While George was not “natural born” due to his foreign birth, there is no requirement that a ‘Natural Born Citizen’s” parents be themselves Natural Born, or for that matter born citizens, Naturalized will do nicely)
Sorry, nope again. The rules in effect when George was born did not make him a US citizen. It gave him dual citizenship till age of majority, at which time he could apply for US citizenship. Otherwise he was a Mexican citizen.
There is also the issue of his father renouncing his US citizenship when he fled to Mexico to avoid prosecution in the US for polygamy.