Final answer:
One quote from "My Heart Is Bursting" that contributes to the assertive tone of Settainte (Satanta)'s speech is: "The Cheyennes are those who have been fighting with you." This quote shows Settainte's bold and straightforward approach in addressing the conflict.
Step-by-step explanation:
One quote from "My Heart Is Bursting" that contributes to the assertive tone of Settainte (Satanta)'s speech is:
O The Cheyennes are those who have been fighting with you. They did it in broad daylight so that all could see and know it — and understand that it was they who struck the blow.
This quote shows Settainte's bold and straightforward approach in addressing the conflict between the Cheyennes and the audience. By emphasizing the Cheyennes' actions in a clear and direct manner, he asserts their involvement and demands acknowledgment.
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