Coversation between two friends

What were the strengths used to persuade the audience in the speech “i have a dream” i really need on this one. i also posted a few more. can someone ?

Most children brought up in brooklyn before the first world war remember day there with a peculiartenderness. it was the day children went around "ragamuffin" or "slamming gates," wearing costumes topped off by apenny maskbased on this excerpt, what is the author's purpose in writing?

Define foreshadowing and provide an example of it from oedipus the king.