What features of Walt Whitman's poems are stylistically or thematically romantic?

Walt Whitman's poems often exhibit Romantic themes such as a celebration of nature, the individual's connection to the universe, and the importance of intuition and emotion over logic and reason. Stylistically, his free verse and use of expansive language and vivid imagery evoke a sense of awe and wonder, characteristic of Romanticism. Additionally, his focus on the beauty and power of the individual and the exploration of the self align with Romantic ideals.