Beacon light of hope, flames of withering injustice, crippled by the manacles of segregation and the chains of discrimination, island of poverty, vast ocean of material prosperity, tranquilizing drug of gradualism, dark and desolate valley of segregation, sunlit path of racial justice, quicksands of racial injustice, solid rock of brotherhood.
Some of metaphors include 'beacon light of hope 'found in the first stanza. Another one is 'seared in the flames of withering 'still in first stanza. There is also 'lonely island of poverty'. A metaphor is figure of speech in which a phrase is applied to an object. Read more from famousbymorning.com/metaphors-in-the-i-have-a-dream-speech.htm.