The dichotomy exists and will forever exist no matter what your opinions are. We didn't force the dichotomy, nonwhites decided they'd never let it go. So here we are. And race is about far more than skin color.

Say you are Norwegian-American or whatever, they still see you as white and they will treat you as such.

The reason why nonwhites get a hyphen is because this country was founded by and for white people and until recently, whites were the overwhelming majority so "American" meant white American.