The answer is this:
If you were a Skrull exiled to the Earth and you had two choices,
A. Take the Identity of a black man working at an office making 75K a year
B. Take the identity of a white man working in that same office as a maintenance man making 30K a year
In this country who has the greater potential to have a fulfilling life? Remember you are a green alien that can't go home and once you transform into this being you are stuck in that form?
You would pick being black based on a slight advantage in salary? What about potential for growth?
I'm black and I love it, but saying a poor white dude can't easily surpass my income because of his skin color is ridiculous. Shit, if Iwas white in my job I'd be making at least double what I make now.