Answer:
Step-by-step explanation:
1.'Praising the productivity of the individuals and being content with one's chosen occupation in life' is the dominating theme of the poem as Whitman praises the individual's work and displays joy in being productive.
2. 'All races of people are beautiful and should be considered a part of America' as Whitman felt that they all together constitute America and each plays their own part and admire their uniqueness and diversity.
3. There is no real difference in theme because Hughes' version "I, too" is inspired by Whitman's "I hear America singing". Both poems celebrate the freedom and uniqueness of individuals. Both the poems are an attempt to expel racism from America and celebrate togetherness and individuality.