The United States does not require new citizens to formally renounce their prior nationality as a condition of naturalization. While the Oath of Allegiance includes language about renouncing foreign allegiances, U.S. law generally recognizes that dual citizenship may exist in practice. Whether dual citizenship is permitted depends largely on the laws of the other country involved. Some countries automatically revoke citizenship upon naturalization elsewhere, while others fully allow dual status. It is important to review the foreign country’s nationality laws before proceeding.

Dual citizenship can carry practical consequences, including tax obligations, military service requirements, or travel restrictions in the other country. U.S. citizens must always use a U.S. passport when entering or leaving the United States. Holding two nationalities may create complex legal obligations abroad, so understanding both legal systems is critical before assuming dual citizenship will be straightforward.