For example, a child born in a foreign country to U.S. citizen parents may be both a U.S. citizen and a citizen of the country of birth. Also, 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.  A person who is automatically granted another citizenship does not risk losing U.S. citizenship.

However, a person who acquires a foreign citizenship by applying for it may lose U.S. citizenship. In order to lose U.S. citizenship, the law requires that the person must apply for the foreign citizenship voluntarily, by free choice, and with the intention to give up U.S. citizenship.  Intent can be shown by the person's statements or conduct. 

The U.S. Government recognizes that dual nationality exists but does not encourage it as a matter of policy because of the problems it may cause.  Dual nationals owe allegiance to both the United States and the foreign country, and they are required to obey the laws of both countries. Claims of other countries on dual national U.S. citizens may conflict with U.S. law.  Either country has the right to enforce its laws, particularly if the person is in that country (even just for traveling). The country where a dual national is located generally has a stronger claim to that person's allegiance. It is important to note that dual nationality may limit U.S. Government efforts to assist citizens abroad. 

Most U.S. citizens, including dual nationals, must use a U.S. passport to enter and leave the United States. Dual nationals may also be required by the foreign country to use its passport to enter and leave that country. Use of the foreign passport does not endanger U.S. citizenship. 

Most countries permit a person to renounce or otherwise lose citizenship. Information on losing foreign citizenship can be obtained from the foreign country's embassy and consulates in the United States. Americans can renounce U.S. citizenship in the proper form at U.S. embassies and consulates abroad.

For more information, see the Citizenship and Nationality area of the State Department's website for American citizens abroad.

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