I think you've associated the entirety of concentration camps with the one that's taught in WWII history. There are extermination camps where the goal is efficient mass-murder, forced labor camps where the goal is slavery, both of which are a kind of concentration camps which is simply a place where groups of people are illegally detained. Don't focus too hard on the illegal part because it's always legal in the state that does it. The Japanese internment camps the US used were concentration camps.

In a weird way the events of WWII saved the US from going down the same path because we were on it. Anything literally Hitler did became politically toxic and it's a bit worrying that this toxicity is wearing off. It kept us far away from the fence.

The thing that matters for concentration camps is large groups of related civilians detained to advance a political goal— to restore Germany to its former greatness or to make America great again.