Final answer:
A US citizen does not automatically lose their US citizenship by acquiring dual citizenship. Loss of citizenship can occur through specific actions, such as voluntary renouncement or by accepting certain jobs with a foreign government.
Step-by-step explanation:
A US citizen does not automatically lose citizenship by becoming a dual citizen of another country. There are specific actions, however, that can lead to loss of US citizenship, such as voluntarily renouncing it or accepting a job with a foreign government that requires a declaration of allegiance to that government. It is also important to note that while some countries require a choice between nationalities, the US Supreme Court ruled in 1967 that the US does not forbid dual citizenship.