Elaborate on the central idea about social classes that Countee Cullen depicts in his poem "For a Lady I Know." Provide textual evidence for your answer.

In his poem "For a Lady I Know," Countee Cullen depicts the clash between the upper and lower classes of society. The poem is assumed to be about upper-class white Americans who treat African Americans poorly. He points out the audacity of the upper class to presume that African Americans would continue to wait on them forever, even after death:  

She even thinks that up in heaven

Her class lies late and snores

While poor black cherubs rise at seven

To do celestial chores.

This poem suggests that white Americans don’t want to help improve the lifestyle of poor African Americans but are comfortable with the minority races serving them forever.

greet them:

buenas noches.

that is considered night time which is when "good night" is used.