Myrdal believed he saw a vicious cycle in which whites oppressed blacks, leading to poor standards of education, health, morality, etc. among blacks that was then used as justification for prejudice and discrimination. The way out of this cycle, he argued, was to either reduce white prejudice, which would improve the circumstances of blacks, or to improve the circumstances of blacks, which would then reduce the reasons for white prejudice.
https://en.wikipedia.org/wiki/An_American_Dilemma
"reduce white prejudice"