This passage is from the end of then-Senator Barack Obama's November 2007 Speech on the "American Dream." "There has been a lot of talk in this campaign about the politics of hope. But the politics of hope doesn't mean hoping that things come easy. It's a politics of believing in things unseen; of believing in what this country might be; and of standing up for that belief and fighting for it when it's hard. America is the sum of our dreams. And what binds us together, what makes us one American family, is that we stand up and fight for each other's dreams, that we reaffirm that fundamental belief—I am my brother's keeper, I am my sister's keeper—through our politics, our policies, and in our daily lives. It's time to do that once more. It's time to reclaim the American dream." The purpose of placing the line, "what makes us one American family, is that we stand up and fight for each other's dreams, that we reaffirm that fundamental belief—I am my brother's keeper, I am my sister's keeper," at the end of his speech is to

b. encourage the audience to show its belief in America and what it could be.

Explanation:

According to a different source, these are the options that come with this question:

a. use denotative language to establish emotional distance and show his reserve.

b. encourage the audience to show its belief in America and what it could be.

c. offer examples and details to give his audience concrete support for his argument.

d. leave the audience with a lasting impression of his authority and credibility.

In this text, then-Senator Obama talks about what he believes America to be. He reminds Americans of the importance of hoping for things that have not come yet, believing in a promising future and fighting when things are difficult. Obama wants all Americans to take part of this challenge and do their best for their country. The line mentioned in the question is meant to emphasize the importance of the participation of all people in this project. By using it, Obama encourages the audience to show that they believe in America and in what it could be.

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