Background
Walter Whitman (May 31, 1819 – March 26, 1892) was an American poet, essayist and journalist. A humanist, he was a part of the transition between transcendentalism and realism, incorporating both views in his works. Whitman is among the most influential poets in the American canon, often called the father of free verse. His work was controversial in its time, particularly his 1855 poetry collection Leaves of Grass, which was described as obscene for its overt sensuality. Whitman's own life came under scrutiny for his presumed homosexuality. wikipedia 
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