What is the tone of Walt Whitman's poem, "I Hear America Singing"?

Question

I am writing an english paper and would like to get another opinion on the tone of the poem.

Answer 1

Whitman celebrates the hustle and bustle of a booming economy in a growing young country.

Answer 2

Optimistic. People are doing hard work and he hears them singing.  

Answer 3

Celebratory