It is a <em>Compound Subject</em>.
Answer:
The speaker's dream for America different than the reality he describes below in complete details.
Explanation:
The poem discourses the American dream that never endured for the cheap-class American and the sovereignty and justice that every foreigner wished for but never endured. In his poem, Hughes expresses not only African Americans but other economically weaker sections and minority organizations as well.
I think a colon should be placed after approached, included, and cultures.
Hope this helps!
