Cite the extended metaphor king uses what is it meaning ? lines 17-31

According to a different source, the question refers to the speech "I Have a Dream" by Martin Luther King.

The metaphor that King uses in lines 17-31 is that of cashing a check. King tells us that the black people of the country were promised equal rights and he compares this to a check. However, they have not been able to cash it, as the country has refused to give them the rights that they were promised after emancipation.

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mark twain, real name samuel langhorne clemens, was an american writer, humorist, entrepreneur, publisher, and lecturer. among his novels are the adventures of tom sawyer and its sequel, the adventures of huckleberry finn, the latter often called "the great american novel". wikipedia