Unaccompanied Alien Children

Unaccompanied Alien Children (or UAC, also referred to as unaccompanied alien minors or UAMs) is a United States government classification for children in immigration custody and the name of a program operated by the Office of Refugee Resettlement (ORR; a division of the United States Department of Health and Human Services, HHS) to house and care for them. The term designates unaccompanied minors who are aliens, typically those who have been apprehended outside of a legal port of entry or judged inadmissible upon their entry.

Source: Wikipedia — Unaccompanied Alien Children (CC BY-SA 4.0)