“First”

I went to secondary school in murica.

In a class that covered murican history 1850-present, we were told by the teacher that the Japanese-muricans living in murica that were interned in murica during WW2 were put in re-concentration camps. They were not put in concentration camps. The teacher said if you wrote concentration camp on the test, you would be marked wrong.

Much later, I met a person that had a family member in one of those concentration camps. That family member got a nickname because they were good at running out of the camp, stealing food, and coming back to feed their fellow concentration campers.

So yes, according to that teacher and if I had to guess their opinion, El Salvador's prison is likely the first concentration camp in murican history.

The teacher's dead now. Fuck him.