“By the time that Baracke X was finished in 1943, millions of European Jews had already been killed in the gas chambers at Treblinka, Belzec and Sobibor after being transported to the East, and millions more were destined to be sent to the death camps at Auschwitz and Majdanek.”
https://furtherglory.wordpress.com/2013/03/14/why-did-the-nazis-build-a-gas-chamber-at-dachau-if-they-werent-going-to-use-it/
Dachau may not have used the “shower room” to kill but the killing and torture did happen.
I visited there in 1953 while stationed at Munich. I saw the “shower room” with names scratched in the walls. We were told how the bodies were stacked in layers as they died. The smallest and weakest were on the bottom. The strongest were nearest to the ceiling Survival of the fittest in action. I also saw the opened ovens. They had been running 24 seven but couldn’t keep up with the work load. There were many more examples. DO NOT assume Americans would never commit such atrocities. Just look at the situations happening NOW