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Just go to any US consulate site and look up "Loss of US citizenship". I think there are means in place for losing one's citizenship.

Causes of Citizenship Loss

U.S. citizens are subject to loss of citizenship if they perform certain acts voluntarily and with the intention to relinquish U.S. citizenship. These acts include:

1. Obtaining naturalization in a foreign state

2. Taking an oath, affirmation or other formal declaration to a foreign state or its political subdivisions

3.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

4. Accepting employment with a foreign government if (a) one has the nationality of that foreign state or (b) a declaration of allegiance is required in accepting the position

5. Formally renouncing U.S. citizenship before a U.S. consular officer outside the United States

6.Formally renouncing U.S. citizenship within the U.S. (but only "in time of war")

7. Conviction for an act of treason.