The US is facing a crisis of economic self-segregation.  Children who grow up in schools with poverty rates over 50% have significant achievement gaps compared to those who don't.  Diluting poverty in a school means reducing the poverty rate by adjusting school boundaries, placing attractive choice programs that will draw students from wealthier areas, or taking other steps that will ensure that the educational environment is less segregated than the neighborhood the school is in.  To oversimplify, if your parents didn't go to college, you might still go to college if you know some people who did.  If your parents didn't go to college, and no one else in your schools parents' did either, you're not likely to go.  
https://www.washingtonpost.com/news/education/wp/2016/05/17/on-the-anniversary-of-brown-v-board-new-evidence-that-u-s-schools-are-resegregating/