The Oath of AllegianceI hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty, of whom or which I have heretofore been a subject or citizen;
that I will support and defend the Constitution and laws of the United States of America against all enemies, foreign and domestic;
that I will bear true faith and allegiance to the same;
that I will bear arms on behalf of the United States when required by the law;
that I will perform noncombatant service in the Armed Forces of the United States when required by the law;
that I will perform work of national importance under civilian direction when required by the law;
and that I take this obligation freely, without any mental reservation or purpose of evasion;
so help me God.
"The United States does not recognize "dual citizenship" for naturalized citizens."
Sorry to have to correct you, but the US just does not place any such restriction on naturalized US citizens. For several years now, as part of my research for various articles that I have written for Action America, that sometimes relate to this issue, I have become very familiar with this subject and I can assure you that there are many naturalized citizens in the United States, who still legally hold citizenship in the country of their birth, under the laws of both countries.
There is a lot of confusion about this issue and it depends upon the laws of both of the countries involved. If such a restriction were placed on a naturalized citizen of the US, it would be because of the laws of the country of his birth (ex: Communist China, North Korea and Japan, who do not recognize dual citizenship) and not US law. If the laws of the birth country of the naturalized US citizen allow dual citizenship, then there is no requirement for the naturalized US citizen to give up his other citizenship. (Obviously, when a third or fourth country is involved, this complicates matters.)
The misleading statement in the Oath of Allegiance, only serves to muddy an already confusing matter, as it would lead an uninformed reader to believe that giving up one's previous citizenship was a requirement for naturalization. However, the law makes no such requirement and in fact, is mum on the subject.
The US State Department web site (http://travel.state.gov/dualnationality.html) has this to say, as part of their official statement on the subject of "Dual Nationality (Citizenship)":
A U.S. citizen may acquire foreign citizenship by marriage, or a person naturalized as a U.S. citizen may not lose the citizenship of the country of birth. U.S. law does not mention dual nationality or require a person to choose one citizenship or another.
Furthermore, as a result of a 1998 Mexican law, their citizens do not have to give up their Mexican citizenship, if they should become US citizens. Regardless of whether you think this is right or wrong, it's a fact that we have to live with, until such time as the law is changed.
BTW, certain types of lobbying on behalf of and under the instruction of a foreign power (paid or unpaid), against the interests of the United States, has been ruled, in certain rare cases, as an act that expressed an "intention to give up U.S. citizenship." I imagine that the judge that you get and the severity of the actual actions that you took, would make a difference in that case. At any rate, such an act, if proved, is grounds for losing one's citizenship, even if you were born here. That's why Johnny Taliban's (John Walker's) taking up arms to fight against US troops can easily be said to have been an act taken with the "intention to give up U.S. citizenship". In most cases, proving intent is difficult. But, taking up arms for a foreign power, against the United States, is a pretty clear sign of intent.
But, there is no US law requiring naturalized citizens to renounce their previous citizenship(s).