This posting identifies the methods that King uses to make his language clearer, vivid, and appropriate. It also comments on King's use of familiar words, concrete words, imagery, and organization in the writing.
As you review the speech, please allow my notes to guide you.
Please note his use of allusions. He cites famous texts and documents such as the Bible, The Gettysburg Address, and the Declaration of Independence within his address. By doing so, please also note how he gains credibility and ethical appeal to people's sense of patriotism. He also uses "My country, tis Of thee" at the end of his speech to gain patriotic appeal.
In terms of organization and style, research calls it "a political treatise, a work of poetry, and a masterfully delivered and improvised sermon, bursting with biblical language and imagery" (http://www.presentationhelper.co.uk/martin-luther-king-i-have-a-dream-speech.htm). He embodies two halves, almost juxtaposed, as he shows the first part of racial injustice and negative effects of racism and then the hopeful latter half of a future vision of peace, unification, and ...
This posting offers a rhetorical analysis of this text.