What are two effective vocal strategies Martin Luther King, Jr. uses in the second half of his "I Have a Dream" speech? How were these strategies used...

Beginning
with his rhetorical repetition of "I have a dream," two effective vocal
strategies Martin Luther King, Jr. uses in his "I Have a Dream" speech
are pause and pitch
inflection.

Effective public speakers use
pauses between points to emphasize them and let their points sink
into the minds of the audience. King effectively uses pauses after each time he says the word
dream and even varies the length of the
pauses. For example, the pause between the words dream and
that in the sentence beginning with "I have a dream that one day this
nation will rise up" is twice the length of the pause after he says the clause, "I
still have a dream." Both pauses create dramatic emphasis, but
the second pause is even more dramatic because it falls where there is no punctuation. The
dramatic second pause gives him time to accumulate the breath support he needs to powerfully
rise in pitch inflection upon the word one.

Aside from
pauses, King also uses rises and drops in pitch inflection to
create emphasis and emotional impact.
One example of varied pitch inflection can be seen in the sentence, "It is a dream deeply
rooted in the American dream." In the word American, King rises in
inflection at the syllable -mer; he then begins dropping in inflection
starting at the syllables -i and -can.
King's greatest drop in inflection occurs at the word
dream. His rise during the word American helps capture
the fact that, despite Americans' failings, King values and has
faith in his country. His dramatic drop at the word dream
helps capture his sorrow that African American's own dreams for
freedom still have not yet been fulfilled in America, despite the fact that their dreams are
deeply "rooted in the American dream."