Here´s a working thesis with potential: you have highlighted an important aspect of the novel for investigation. However, it´s still not clear what your analysis will reveal. Your reader is intrigued but is still thinking, "So what? What´s the point of this contrast? What does it signify?" Perhaps you are not sure yet, either. That´s fine_begin to work on comparing scenes from the book and see what you discover.
Free write, make lists, jot down Huck´s actions and reactions. Eventually you will be able to clarify for yourself, and then for the reader, why this contrast matters. After examining the evidence and considering your own insights, you write: Through its contrasting river and shore scenes, Twain´s Huckleberry Finn suggests that to find the true expression of American democratic ideals, one must leave "civilized" society and go back to nature. This final thesis statement presents an interpretation of a literary work based on an analysis of its content. Of course, for the essay itself to be successful, you must now present evidence from the novel that will convince the reader of your interpretation.
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