It’s been well publicized that deportations have skyrocketed over the last decade. Over 3 million undocumented immigrants were deported between 2005 and 2013 alone. But less discussed are the estimated 1.5 million American citizen children who have been affected by a parent’s removal. That number comes from Dr. Luis H. Zayas, a professor at the University of Texas at Austin, who chronicles the mental health consequences of deportations on children in his new book Forgotten Citizens: Deportation, Children, and the Making Of American Exiles and Orphans.