So what if they would? Nazis also considered Italians 'aryan' (stupid word) because of some moronic theory of germanic settlers having started the roman empire, and upgraded the racial status of their central/eastern european allies for pretty much no reason other than political expediency. The whole thing is a joke, white-supremacist theory has been heavily watered down so the resident racists of wherever can feel better about themselves; Nazi ideology rejected Nordicism because Germany is full of alpines, eastern European Nazis are 'pan-aryanists' to include themselves in the 'master race' because they are too intellectually feeble to do anything with their nationalism but piggyback on Hitler's ghost when hes too dead to call them subhumans, and American 'white nationalists' include ALL european ethnic groups into some kind of superior meta-race as Americans are too mongrelized for more organic ethnic nationalism (true also because the US is not a european homeland).

The point is that "Aryan" can and is defined as being "White person of Indo-European origin" which includes all Europeans, not just Germans, on the basis that they are Europeans and not on theories that they're part German since Antiquity nor for political reasons. Pan-Aryanism is an ideology which has its origins in the WW2 struggle against Communism and is in no way a means for Eastern Europeans to include themselves as "Aryans" since they already are that.

As for America, the American people (White Americans mind you) are descended from a variety of European peoples, which makes their claim as Aryans perfectly valid since those peoples themselves are Aryan (again, just another word for White). Of course America isn't a "European Homeland" because it's in North America, but that doesn't make it any less of a White country founded and built by White people.