US society and the plans and acts of its ruling class (indigenous genocide, slavery, etc) were huge inspirations to Nazis and German white nationalists generally, who built their colonies in Africa around this and some similar genocidal approaches by the UK. They expanded and analogized them as part of their plans for gaining and wielding power, especially in defining their race science and settler-colonial plans for Slavic peoples. The US has never been meaningfully anti-fascist, more like constantly quasi-fascist or nebulously ur-fascist, just lacking an impetus to condense around a particular "anti-establishment" fascist movement in response to a crisis of capitalism. The existing apparatuses, which are still fashy in essence (anti-left, anti-worker, anticommunist) quell those crises and suppress the left prior to any congealed fascist response.