Sibling comment has it about right: https://news.ycombinator.com/item?id=44450898

One of the underlying contradictory elements in the national philosophy of America since its founding has been white supremacy. Yes, that conflicts with "believe all men are created equal". No, this hasn't been properly resolved despite periods of extreme violence. I believe it's the anniversary of Gettysburg about now?

Hence the $45bn for putting people in camps. It's right there in the budget. Of course, that drip-fed in bipartisan fashion: there have been (smaller!) internments of immigrants for a long time.