What is the connection between Langston Hughes "Harlem (A Dream Deferred)" and the central theme of Lorraine Hansberry's play "A Raisin in the Sun" ?

Both
Langston Hughes "Harlem (A Dream Deferred)" and s ""  focus on the effect of
racism on African-Americans. In both cases, the focus of the authors is not merely to document
incidents of racism and show its practical effects, although many details of the economic
effects of racism surface in both works, but also to analyse the psychological effect of racism
on its victims. The specific theme is dreams and ambitions, and the way that living in a racist
society prevents subalterns from having the opportunities to pursue their dreams freely and
succeed at them.