In, Theme for English B, the poem by Langston Hughes, what would you state as the plot?

There is really not very much of a plot to this poem.  It is much more about a theme or idea than it is about a plot or set of events.

The only thing that actually happens in the poem is that the speaker's English teacher assigns him a "theme" or essay.  The speaker is supposed to let the essay "come out of" him.

The speaker does that, we do not know where.  In his essay, he reflects on the way that being black in America makes him sort of different from his teacher, but not as different as people might think.