Americans often did this before by making heroic-warrior myths out of American Indian tribes that were on the losing side of historical conflicts just like the Spartans. Just think of all the American Indian imagery in the Boy Scouts from its early years, high-school sports teams named after such tribes, etc. Of course now, use of Native American motifs is seen as cultural appropriation, but the Spartans are far removed enough in time – and viewed as the same race as modern privileged classes – that use of Spartan motifs is safe from such accusations.