Answer:
Personification
Step-by-step explanation:
Looking at the given extract from Walt Whitman's poem "I Hear America Singing," it indicates personification.
Personification is a figure of speech, or implied means of communicating an idea, believe or concept, that stands for a non-human object as thou it possesses human like nature in order to affirm human attributes or characteristics to it, sometimes through thecl way of a metaphor.
In this scenerio, when Whitman wrote "I hear America singing", he affirmed on America attribute or ccharacteristic of human beings, which is the likelihood to sing.