[jackibutterfly]

"So, if two Americans are on vacation in England and the woman gives birth in England, that child could not be president?"

And, what about military families? My niece was born in Germany to a military man. What about her?

[CodeToad]

“And, what about military families? My niece was born in Germany to a military man. What about her?”

The law has always been that persons of government service are not subject to foreign law but to US law, and are therefore within the jurisdiction of the US at all times anywhere. So, your niece would be by birth a US citizen.