Is there alliteration in the poem I Hear America Singing?

I was able to find one example of alliteration in that poem. The line 'the shoemaker singing as he sits on his bench' contains alliteration with the Words 'shoemaker singing.'

Alliteration is defined by the occurence of the same letter or sound at the beginning of adjacent Words. 'Shoemaker' and 'singing' both start with the letter 'S', and the 'S' is making the same consonant sound in both Words. Hence, this is alliteration!