Song of Myself was included in Walt Whitman's major work, Leaves of Grass. Whitman paid for the publication of the first edition himself. Three Lions/Getty Images hide caption

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James Wilkinson rose to the rank of brigadier general during the Revolutionary War, and after a break from military service was commissioned a major general in the War of 1812. Walker & Company hide caption

itoggle caption Walker & Company

Lange's "Migrant Mother" is one of her most famous photographs. Dorothea Lange/Courtesy of the Library of Congress hide caption

itoggle caption Dorothea Lange/Courtesy of the Library of Congress

Before he became the 26th president, Theodore Roosevelt (center) led the men of the 1st Cavalry Volunteers, known as the "Rough Riders," on San Juan Hill during the Spanish-American War in 1898. William Dinwiddie/Hulton Archive/Getty Archive hide caption

itoggle caption William Dinwiddie/Hulton Archive/Getty Archive