However, Title 8 can not be defined without its connecting laws that pertain to expatriation & denaturalization. Anyone who has had a former citizenship/allegiance, including children born within the United States, are subject to denaturalization laws. Natural born are not subject to these laws because they never owed allegiance to any other but the United States. Its called the doctrine of “statelessness” and there have been many cases including one just recently decided by SCOTUS where it was determined that a child born with dual allegiance would not be left stateless if American citizenship was denied or taken away.
IOW, Obama would never be left stateless because he has at least one foreign country that claims him as one of their own.
Title 8 > Chapter 12 > Subchapter III. I know that. Nothing in there regulates dual citizenship that I'm aware of. Nor should it - the U.S. can no more control the citizenship laws of other countries than they can control our's.