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

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

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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

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