How are these authors similar? Poe, Hawthorne, Melville, Douglas, Twain?

Question

I know that they are American Literature..How about their style of writings? How are they similar

Answer 1

Although all had their unique writing styles, one would argue that these aspects of their style are comparable if one realizes that differences are as illuminating as similarities:
versification, narrative technique, and dramatic structure; contextualization, including biographical,literary-historical, and cultural-historical.
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Answer 2

They are not similar. Each has his own style.