USA's southern border represents a focus of a problem with root cause that spans generations. It began around the time of Regan with the Iran Contra affair. Gang deportation exacerbated the issue years later. Trump decimated the border infrastructure in terms of organization, negotiation, and management. All this has led to what we have now. At least some improvement might have come through the bill before Congress. However, in the tradition of  government waste, months of negotiation were scuttled. We can thank D.T. a.k.a. Dick Tatorial.