It's complicated (it depends on whether only one parent or both parents is a US citizen, what the other parent is, whether the parents are married or not, whether the US citizen parent has ever lived in the US or its territories and for how long and when, and exactly when the baby was born) and it doesn't work quite like that anyway. A US citizen doesn't lose citizenship by the mere act of living outside the US.
You've presumably got some sort of specific scenario in mind. Use the USCIS website (in the related links) to see what rules apply in the specific case you're thinking of (and remember that in general, once a citizen, always a citizen, unless you deliberately renounce your citizenship).
France was not playing their hardest but some people think Mexico bribed France into losing.
Napoleon III
D-Day
US and UK allow Dual citizenship. A person can be a US citizen and a citizen of UK if he/she desires to. But if a person applies to get naturalized as a citizen of UK when he/she is already a US citizen, then it will lead to losing US citizenship.So a person can have US & UK citizenship as long he/she is not a naturalized citizen of UK.
I think you never lose it. I have relatives who have lived abroad for 25 years, and have not visited the US in 5 years. They don't lose it.
It was France as they lost out to Italy.
The French and Indian War.
Don't do it. You can risk losing everything!
No: It was a viable plan for the defeat of France.
Death before Honor. Translation: Death before losing their honor.
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Their (french) regret eas when columbas surrender to the indians