Is that right? I thought the US allows double citizenships?
Most of the U.S.A. table tennis team is made up of natural born Communist Chinese.
The way I understand it is like this:
IF you are born with dual citizenship, (Say, a US serviceman father serving in Korea, married to a Korean National - the child being of an American citizen serving overseas.) you may retain dual citizenship.
However, if you are born in the USA (natural-born citizen) and swear allegiance to another Nation (by taking their citizenship) it is a de facto renouncement of your US citizenship.
I could be wrong here; am researching.
Just ask Barry Obama and Peter Jennings....