Dr. King's repetition of "I have a dream" serves
what purpose?

The repetition serves as emphasis. Since the speech was given orally, the repetition also helps the audience comprehend his points. It is often more difficult to just hear information than it is to read or have visual aids, so the repetition helps the audience track with the speech and King's tenets.

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Explanation:

the united states presidential election of 1844 was the 15th quadrennial presidential election, held from november 1, to december 4, 1844. democrat james k. polk defeated whig henry clay in a close contest that turned on the controversial issues of slavery and the annexation of the republic of texas.

the answer should be:

their party has more members.

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