If you can't visit in person, then start here: http://www.auschwitz.org/en/gallery/exhibits/evidence-of-cri...
History will eventually regard the imperialist behavior of the US quite negatively. This is no comparison to Hitler’s Germany but it’s intellectually dishonest to ignore that they designed the racial Nuremberg laws on Jim Crow America. Racism, segregation, and the like are an intrinsic part of American history and one of its exports.
We built concentration camps for Japanese during the war and nothing came of that either.
What exactly is imperialist about border and immigration enforcement within the United States?
Our border enforcement is a small piece of a much larger program of imperialism. We overthrow and destabilize central and South American governments which are not sufficiently pliant client states. Then we make a show of rejecting groups fleeing those conditions even though the vast majority of undocumented immigration does not happen via border crossing.
Heck, ICE doctors haven’t been caught performing forced hysterectomies for almost two years:
https://www.cnn.com/2020/09/16/us/ice-hysterectomy-forced-st...
It’s insulting, naive, and simply wrong to suggest an equivalence to our enforcement of immigration law on people voluntarily emigrating to the United States.