Final answer:
Mark Twain, the renowned author, realistically portrayed southern speech patterns along the Mississippi River through the use of dialect and regional humor.
Explanation:
Mark Twain, also known as Samuel Langhorne Clemmons, is the highly popular author who made stories realistic by capturing the speech patterns of southerners along the Mississippi River. His use of dialect and regional humor in works like The Adventures of Huckleberry Finn showcased the everyday speech of characters, making the stories more relatable and authentic.
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