I’m a U.S. citizen; do I need to apply for travel authorization using the Electronic System for Travel Authorization (ESTA) prior to traveling to the U.S.?
The Electronic System for Travel Authorization (ESTA) does not apply to U.S. citizens. Only citizens of Visa Waiver Program countries (such as Sweden) must apply for travel authorization online prior to traveling to the U.S. (Full list of Visa Waiver Program countries.) Please note that according to Section 215 of the U.S. Immigration and Nationality Act (8 U.S.C. 1185), it is illegal for an U.S. citizen to enter or leave the U.S. on any other document than an U.S. passport. This applies to dual citizens as well, meaning that persons holding e.g. both Swedish and American citizenships and passports must enter and leave the U.S. on a U.S. passport. They may not enter/leave the U.S. on a Swedish passport. This applies to children as well as adults.
