In what ways is I have a Dream by Martin Luther King Effective?

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In what ways is " I have a Dream" by Martin Luther King Effective?

Martin Luther King was an orator and had to put across his beliefs in an imaginative and emotionally suggestive way. Many of his audience had travelled far to listen to his speech. Many would also be irritable and uncomfortable in the hot august weather, He had to keep them occupied and inspire them in a way that would have positive resonance and not provoke anger and violence. His speech would be televised to the nation and must therefore have been suitable for a variety of audiences (his speech was not purely to be listened to by the black community)

His speech was effective in achieving the above targets in the following way:

The first example of this in the given excerpt of his speech that warms his audience to him is by using we (1st person plural). By this he is treating the group as a whole, as if they are one body that must help each other, very inclusive and warming, making everybody feel equal; it symbolizes brotherhood.

The second example is by welcoming the white people of the congregation,