A consistent source of inspiration for poets of the Romantic era, the era of Realism, and today is nature.
During the Romantic era, poets like Wordsworth and Coleridge deeply revered nature, often depicting it as a source of beauty, inspiration, and spiritual enlightenment. In the era of Realism, while the focus shifted towards more social and societal issues, nature still played a significant role in illustrating themes of human experience and connection to the environment. Today, contemporary poets continue to draw inspiration from nature, reflecting on environmental concerns, personal experiences, and the relationship between humanity and the natural world.
While other options like abolition of slavery, human sexuality, and technology also inspire poets in various ways, nature remains a central and enduring theme across these different literary periods.