Answer:
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Step-by-step explanation:
King's repetitive use of the phrase "I refuse" in that part of the speech helps to establish his perspective about the ability of mankind to influence and take charge of all situations affecting them.
He employs the continuous use of that phrase to jettison the notion that the present condition and the history of man can prevent him from achieving what he desires. He said, "I refuse to accept despair as the final response to the ambiguities of history. I refuse to accept the idea that the “isness” of man’s present nature makes him morally incapable of reaching up for the eternal “oughtness” that forever confronts him. "
King uses this phrase to ascertain that it is possible to peacefully cohabit without tribalism and racism, without war and social unrest. " I refuse to accept the view that mankind is so tragically bound to the starless midnight of racism and war that the bright daybreak of peace and brotherhood can never become a reality".
The tone of this part of the speech is that of optimism and belief in the possibility of peaceful coexistence among Americans and the world at large. King's repetition of the phrase " I refuse" is to establish this point and reject every negative notion.