* Focus on American Identity: All three poets explored themes of American life and identity, reflecting on the country's history, culture, and landscape.
* Experimentation with Form: While Longfellow largely adhered to traditional forms, both Dickinson and Whitman experimented with form and structure. Dickinson often used unconventional punctuation and capitalization, while Whitman employed free verse and long lines.
* Exploration of Emotion and Thought: All three poets explored complex emotions and ideas through their work, often using their poetry as a platform for personal reflection and social commentary.
Ultimately, the most accurate answer depends on the specific focus of your question. If you could provide more context about what you're looking for, I can give you a more precise answer.