recent talks about native dna

so a lot of people would talk about groups falsely claiming native dna. but what i’m curious to know is why no one ever talks about natives having white and/or black admixture themselves. or even having tribes (us and canada) that have no “full blooded” natives and most of those tribal members are more white than native as is. i think it would be interesting to talk about natives and their non native admixture more.