They’re the immigrant children long considered to be the most vulnerable. Many traveled to the U.S. alone, unaccompanied by a parent or guardian. Some were trafficked for labor or sex. A state judge has ruled that each of them has experienced serious abuse, neglect or abandonment and is in need of the state’s care.…

The federal Office of Refugee Resettlement is supposed to care for migrant children who arrive in the country alone. But new policies are stranding kids in shelters and undermining their mental health. Some children have chosen to return to the countries they fled.