Even without death camps we have a wide variety of concentration camps here in the US, many which have or had conditions bad enough to cause death at a higher rate. Whether it's the indigenous genocide and reservation system, the prison system which is the biggest forced labor camp system in the world, mostly for Black and poor people, the immigrant detention centers that separated children of legal asylum seekers from their parents, or the Japanese internment camps in WWII, the US really is a world leader in fascism.