So? Lots of young muslim men traveled to Pakistan in the early 80’s. They’d slip across the border and wage jihad against Russians in Afghanistan. What difference does it make?
U.S. Law requires the signatures of both parents on a passport application. If one parent is absent from the relationship, then it is impossible or extremely difficult for a minor to obtain a U.S. passport.
If one of the parents is not a U.S. citizen, then the child may become a dual citizen or national of the country of the parent with foreign nationality and a U.S. Citizen. Consequently, the parent may be able to obtain a non-U.S. citizen passport.
U.S. Law requires U.S. Citizens to exit and return to the U.S. with a U.S. passport. But, there are no exit controls in the U.S. as they pertain to the U.S. State Department. Consequently, minors with dual citizenship are allowed to travel internationally on a foreign passport. When the minor returns, immigration will notify the State Department a child with foreign nationality has returned to the U.S. without an U.S. entry visa. A record of the child’s entry into the U.S. with a foreign passport and no entry visa will be created and stored.