In this photo provided by US Customs and Border Protection, migrants sit in one of the cages at a facility in McAllen, Texas on June 17, 2018. Customs and Border Protection's Rio Grande Valley Sector via Associated Press
That difference is significant — while unaccompanied children in 2014 knew what to expect when they arrived at the border and were taken to the holding facilities, the children who have been separated from their parents are often much younger, and
had not expected to be taken away from their families.