How does the paragraph listed below contribute to the development of ideas in the text?
In a sense we've come to our nation's capital to cash a check. When the architects of our republic wrote the magnificent words of the Constitution and the Declaration of Independence, they were signing a promissory note to which every American was to fall heir. This note was a promise that all men, yes, black men as well as white men, would be guaranteed the "unalienable Rights" of "Life, Liberty and the pursuit of Happiness." It is obvious today that America has defaulted on this promissory note, insofar as her citizens of color are concerned. Instead of honoring this sacred obligation, America has given the Negro people a bad check, a check which has come back marked "insufficient funds."
It proves that African Americans are never going to stop fighting for their civil rights and freedom.
It demands that African American receive financial compensation for the injustices they have suffered.
It shows how essential African Americans' civil rights are to them by comparing rights to money.
It emphasizes that African Americans have been cheated the civil rights that the nation owes them.