idk
for the most part racial superficial differences are obvious
as it is with the 2 genders - just drop yer drawers to conclude what you are lol
but in our minds? yeah, there's a whole nuther universe in there!
I have to disagree with your first statement.
It is a matter of history that in the United States (as well as some other countries), entire linguistic, philosophical, legal, and pseudo-scientific structures were built to defend the ridiculous proposition that the color of your skin had any significance to anything but your need for sunblock.
Examples: vocabulary like "mulatto," "quadroon," "octoroon."
Legal concepts like Virginia's "one drop of Black blood" law, and the fact that White people could not be enslaved.
The 1911 Britannica article explaining "scientifically" how skull development during adolescence explained why Black people were less intelligent than White people and obsessed with sex.