This document provides a biography and overview of the 19th century American poet Walt Whitman. It notes that he was a nurse during the Civil War and opposed the extension of slavery. One of his major works was Leaves of Grass, in which he pioneered the use of free verse. The document also analyzes his poem "Out of the Cradle Endlessly Rocking" about the loss of his mother, focusing on its themes of love, loss, and the poet's ability to translate personal experiences into song.