Dual nationality and US laws
Each country has its own citizenship laws based on its own policy. People may have dual nationality by automatic operation of different laws rather than by choice. For example, a child born in a foreign country to US citizen parents may be both a U.S. citizen and a citizen of the country of birth.
A US citizen may acquire foreign citizenship by marriage, or a person naturalized as a US citizen may not lose the citizenship of the country of birth. US law does not mention dual nationality or require a person to choose one citizenship or another. Also, a person who is automatically granted another citizenship does not risk losing US citizenship. However, a person who acquires a foreign citizenship by applying for it may lose US citizenship. In order to lose US citizenship, the law requires that the person must apply for the foreign citizenship voluntarily, by free choice, and with the intention to give up US citizenship.
Use of the foreign passport does not endanger US 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 US citizenship in the proper form at US embassies and consulates abroad.
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