[rrouse]

The State department website on it says that the renunciation is final unless it meets certain guidelines, which basically means that if you did it at age 18+, you're going to have to go through the immigration process just like every other non American.

http://travel.state.gov/law/citizenship/citizenship_776.html

[philiphodgen]

That's correct. Once you have renounced U.S. citizenship you are like all the other billions of people on the planet--if you qualify to re-enter the USA and apply for citizenship, you can do so.

The tax rules for giving up citizenship have specific provisions fully expecting people to give up citizenship twice. :-)

Disclaimer: I am a lawyer, and I do lots and lots of expatriation cases.

[bdamm]

Presumably rules regarding American parents transmitting citizenship could come into play.