The story ( as far as I can remember ) is that a family of Germans moved to the U.S. with their 1 year old child. 24 years later the child graduated university and ... needs to apply for a green card or permanent VISA.
US government refused, so she had to come back to Germany.
I've never understood why U.S. is so protective in terms of citizenship. In most of the EU countries you get naturalized ( receive citizenship ) if you spend certain amount of time in the country and pass a test ( Germany I think it's 7 yrs ).