Based on the U.S. Department of State regulation on dual citizenship (7 FAM 1162), the Supreme Court of the United States has stated that dual citizenship is a “status long recognized in the law” and that “a person may have and exercise rights of nationality in two countries and be subject to the responsibilities of both. The mere fact he asserts the rights of one citizenship does not without more mean that he renounces the other,” (Kawakita v. U.S., 343 U.S. 717) (1952). In Schneider v. Rusk 377 U.S. 163 (1964), the US Supreme Court ruled that a naturalized US citizen has the right to return to their native country and resume their former citizenship and also remain a US citizen, even if they never return to the United States.

I've read through some resources and I am still confused about retention of UK citizenship. My fiance and I have been discussing whether or not he should become naturalized when the time is right. He does not want to revoke UK citizenship. It appears that the UK will allow a person to retain their UK citizenship even if they become a citizen of another country. My question is...When you swear your oath of allegiance when becoming an American citizen do you renounce your UK-ness? Has anyone here from the UK become a US citizen and is still a UK citizen?

Thanks all!