So where is it?
Unable to click on a link?
Here it is. Read it and weep for your own ignorance.
Sec. 301. [8 U.S.C. 1401] The following shall be nationals and citizens of the United States at birth: (c) a person born outside of the United States and its outlying possessions of parents both of whom are citizens of the United States and one of whom has had a residence in the United States or one of its outlying possessions, prior to the birth of such person;
Notice please that it says NOTHING about this U.S. law being rendered moot if the place outside the United States grants them citizenship as well.
U.S. law is not subordinate to foreign law - even if you really really want it to be. It isn’t.
You said... “Georgie’s father was a Mexican citizen. This cancelled out Georgie being a U.S. citizen.” that is wrong.
You asked when George Romney became a U.S. citizen and I answered you - he became one at birth.
You asked according to what law, and I provided a link.
You were too lazy to follow a link - so now I quoted the law.
But you read something from Google once - so I guess US law and facts do not mean anything to you. You are really amusing!