mini said:
I'm not going to get into this again. What you wrote is just wrong. Please research the issue before you comment.
As for not telling anyone, that is also a bad idea. There are times when you must swear under penalty of perjury that you have no alliance to any other country such as when you renew your passport. To swear to this when it is not true is a criminal offense. You must inform them that you do in fact hold an allegiance to another country and they will remove this part of any document you are signing. Committing perjury is a bad idea.
You don´t lose automatically the US citizenship:
POTENTIALLY EXPATRIATING ACTS
Section 349 of the Immigration and Nationality Act (8 U.S.C. 1481), as amended, states that U.S. citizens are subject to loss of citizenship if they perform certain specified acts voluntarily and with the intention to relinquish U.S. citizenship. Briefly stated, these acts include:
obtaining naturalization in a foreign state (Sec. 349 (a) (1) INA);
taking an oath, affirmation or other formal declaration to a foreign state or its political subdivisions (Sec. 349 (a) (2) INA);
entering or serving in the armed forces of a foreign state engaged in hostilities against the U.S. or serving as a commissioned or non-commissioned officer in the armed forces of a foreign state (Sec. 349 (a) (3) INA);
accepting employment with a foreign government if (a) one has the nationality of that foreign state or (b) an oath or declaration of allegiance is required in accepting the position (Sec. 349 (a) (4) INA);
formally renouncing U.S. citizenship before a U.S. diplomatic or consular officer outside the United States (sec. 349 (a) (5) INA);
formally renouncing U.S. citizenship within the U.S. (but only under strict, narrow statutory conditions) (Sec. 349 (a) (6) INA);
conviction for an act of treason (Sec. 349 (a) (7) INA).
ADMINISTRATIVE STANDARD OF EVIDENCE
As already noted, the actions listed above can cause loss of U.S. citizenship only if performed voluntarily and with the intention of relinquishing U.S. citizenship. The Department has a uniform administrative standard of evidence based on the premise that U.S. citizens intend to retain United States citizenship when they obtain naturalization in a foreign state, subscribe to a declaration of allegiance to a foreign state, serve in the armed forces of a foreign state not engaged in hostilities with the United States, or accept non-policy level employment with a foreign government.
DISPOSITION OF CASES WHEN ADMINISTRATIVE PREMISE IS APPLICABLE
In light of the administrative premise discussed above, a person who:
is naturalized in a foreign country;
takes a routine oath of allegiance to a foreign state;
serves in the armed forces of a foreign state not engaged in hostilities with the United States, or
accepts non-policy level employment with a foreign government,
and in so doing wishes to retain U.S. citizenship need not submit prior to the commission of a potentially expatriating act a statement or evidence of his or her intent to retain U.S. citizenship since such an intent will be presumed.
When, as the result of an individual's inquiry or an individual's application for registration or a passport it comes to the attention of a U.S. consular officer that a U.S. citizen has performed an act made potentially expatriating by Sections 349(a)(1), 349(a)(2), 349(a)(3) or 349(a)(4) as described above, the consular officer will simply ask the applicant if there was intent to relinquish U.S. citizenship when performing the act. If the answer is no, the consular officer will certify that it was not the person's intent to relinquish U.S. citizenship and, consequently, find that the person has retained U.S. citizenship.
http://travel.state.gov/law/citizenship/citizenship_778.html
Some counties where you lose your citizenship:
Japan
China
Germany (there is a procedure for dual citizenship)
Switzerland
There is your answer
