Well, if they’re into ‘identity politics’, a lot of them probably identify as ‘aboriginal Americans’. I’m not sure about the Meztizos; I’ve met people from South America who seemed very proud that their father or grandfather had eyes of ‘azul’.
It’s all kind of silly - unless you can prove that you’re of one or another absolutely ‘pure’ heritage (and I doubt anyone can) - you’re all mixed-up-and-turned-around, like all the rest of us.
so we are all basically mutts :)