Nazi Germany literally just copied from the book what Usonians did to aborigenes, which if you don’t know was a whole ethnic state thing, that without taking into account the treatment jews had in the US and black people. Mussolini didn’t invent fascism, that was a thing that built over the years while he certainly gave it more form.

Here you have a video that goes mroe in depth. https://www.youtube.com/watch?v=R1gcipAvplY