Explanation: allusion is a literary device that consists in making a brief reference to a person, an event (historical, political, cultural, etc), or a place. In the given quote, we can see an example of allusions (in this case, references to people) to Millay (Edna St. Vincent Millay) Whitman (Walt Whitman), and Faulkner (William Faulkner), they were all American poets (also playwriters), and their work is appreciated still to this day.
In the passage the poet describes London using personification, the city appears mostly as a "helper" since it gives life and shape to various people who live there.
