William Wordsworth is considered a romantic poet because he was a member of the Romantic movement in literature, which began in the late 18th century and lasted through the 19th century. Romantic poets emphasized emotion, imagination, and a connection to nature. Wordsworth's poetry often explores the beauty of nature, the power of the human spirit, and the importance of personal experience. He also wrote about the common man and his relationship with nature, which was a departure from the traditional poetry of the time that focused on the elite and their experiences.