I think learning about race in class has shown an interesting development towards the attitudes on race throughout American history.
From a modern sensibility, I think we look at race on a surface level. We look at skin alone. Some people might “pass” as another race, to an outsider, due to their skin color.
But in the past, it was about blood. If you had any “blood” of a certain race you were lumped into the race no matter your skin color