Essay on bad effect of junk food

What is the central idea in this advice from branch rickey to jackie robinson?  

How does hughes’ poem, “let america be america again,” represent the idea of the failure of the american dream?

What is most likely the speaker’s reason to open with this? in approaching this problem, we cannot turn the clock back to 1868, when the [fourteenth] amendment was adopted, or even to 1896, when plessy v. ferguson was written. we must consider public education in the light of its full development and its present place in american life throughout the nation. only in this way can it be determined if segregation in public schools deprives these plaintiffs of the equal protection of the laws.