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The text provides evidence that Dr. King continues to challenge the Americans to make America a better nation through his speeches and writings.
What is writing?
The representation of the a language through a scheme of physically inscribed, mechanically transferred, or digitally represented symbols is what writing does as a form of human communication. Writing systems are a way of rendering language into the a form that can be understood by other humans kept separate by time and/or space; they are not themselves naturally spoken human languages (with arguably controversial exception of computer languages). Even though not all languages have written forms, those that do can supplement and expand spoken language's capabilities by developing long-lasting forms of language that are transmitted across distance and preserved over time. It has also been noted that writing itself can now have knowledge-transforming effects because it enables people to externalise their thoughts in ways that are simpler to consider, expand upon, and revise.
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