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"I have a dream that one day this nation will rise up and live out the true meaning of it's creed. We hold these truths to be self evident, that all men are created equal."

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The most effective rhetorical device he uses is repetition because it emphasizes his message.
It is helping him assert that he wants his dream to become a reality.

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The impact of this speech on Dr. King's audience might have been that the black community might have felt motivated to fight for their equality.

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Message/claim: His message is that he wants equality for everyone and for people to stand up against racism.