Originally Posted by
Christopher
They can ask you, but the US authorities can't remove another citizenship from a person. Only the other country can do that, and whether and how that can happen depends on that country's laws.
They can ask you to "denounce" your citizenship. Some oathes, etc can be considered a denouncement by other countries if they are worded in certain ways. When my wife was getting her Italian Citizenship recognized there was a scrutiny of what her grandfather had or had not done in the U.S. at least officially. The consulate official said that they had seem Rome reject citizenship applications for people claiming such under an ancestor who had taken certain actions to denounce their Italian citizenship. It helps, in fact, when the ancestor never became an American citizen since that suggests that they (and thus all their offspring) never quit being "Italian". We got points for her family having been members of an Italian Catholic Association.