Blue + yellow makes green, a new color, it’s neither blue nor yellow it’s it’s own category all together. Same thing here, mixed ppl are there own category they can’t be black, mixed with black but the designation BLACK is not for them
The one drop rule is meant to keep the white race pure and dilute and misrepresent the black race. Jhene aiko is predominantly Asian, she posted her ancestry, yet how do we call her black? Megan Markle barely looks black but ppl still try to call her black to deny her whiteness.
You still haven’t answered as to why Doja isn’t called a black woman. What is them being American have to do with anything?