By law, U.S. citizens, including dual nationals, must use a U.S. passport to enter and exit the United States. U.S. citizens are not eligible for a U.S. visa. U.S./Argentina dual citizens are advised to carry both valid passports (U.S. and Argentina) when traveling to/from the United States. The dual citizen will be required to present their U.S. passport at U.S. immigration and might be requested to present their Argentine passport when going through Argentine immigration.

If your child is a citizen of the United States, they are not eligible for a U.S. visa. This is true even if you have not taken steps to document them as a U.S. citizen. If you want to enter or depart the United States with your child who is a U.S. citizen, you must obtain a U.S. passport for your child.