The law you just posted proves my point, like I said detention centers for children have always existed, look at the law, see where it says "unaccompanied alien child" that means children who have crossed the border without a parent or guardian are taken to these detention centers. What the Trump administration is doing is taking children who have crossed the border with a parent or guardian, taken those children away from them and locking them up in these detention centers, this was not a policy before Trump. Before Trump families were kept together until a court decided what to do with them.