Final answer:
Hawthorne, Melville, and Poe shared a fascination with the dark and mysterious aspects of human nature in their writing within the Gothic genre.
Step-by-step explanation:
One shared trait in the writing of Hawthorne, Melville, and Poe within the Gothic genre might be a fascination with the dark and mysterious aspects of human nature.
These authors, along with other writers like Mary Shelley and Ann Radcliffe, were part of the Gothic literary movement that emerged during the Romantic period in Europe. The Gothic genre often features supernatural and dream-like events, abandoned castles, ghosts, and vampires. It explores the depths of human emotions, including the dark and mysterious aspects of human nature.