Walt Whitman's "I Hear America Singing" it is a great masterpiece originally published in 1996, that talks with celebration about the working people that make up America.
The line on the poem that describes a unified America is:
<h3><em>I hear America singing, the varied carols I hear</em>.</h3>
On this line, he writes, with joyful connotation, about the diverse America,<u> that encompasses many types of </u><em><u>carols (people)</u></em><u> and still unifies as one magnificent single song.</u>