The topic of "What is Our Role in Creating the American Identity?" is that it is necessary for American society to abandon its prejudices and biases, to build an inclusive and powerful society in the future.
In this speech, Twigg reinforces that:
In that case, we can say that the topic of speech is the growing diversity in America. It is possible to see this because the topic of a speech refers to the main subject that the speech wants to convey.
As we can see, diversity in America is the subject on which the whole speech is based, being the main subject.
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