Slavery in Massachusetts is a classis essay by the great American writer, naturalist and philosopher, Henry David Thoreau based on a speech he gave at an anti-slavery rally at Framingham, Massachusetts, on July 4, 1854, after the re-enslavement in Boston, Massachusetts of fugitive slave Anthony Burns. Henry David Thoreau (see name pronunciation; July 12, 1817 - May 6, 1862) was an American essayist, poet, philosopher, abolitionist, naturalist, tax resister, development critic, surveyor, yogi, [3] and historian. A leading transcendentalist, [4] Thoreau is best known for his book Walden, a reflection upon simple living in natural surroundings, and his essay "Civil Disobedience" (originally published as "Resistance to Civil Government"), an argument for disobedience to an unjust state. Thoreau's books, articles, essays, journals, and poetry amount to more than 20 volumes. Among his lasting contributions are his writings on natural history and philosophy, in which he anticipated the methods and findings of ecology and environmental history, two sources of modern-day environmentalism. His literary style interweaves close observation of nature, personal experience, pointed rhetoric, symbolic meanings, and historical lore, while displaying a poetic sensibility, philosophical austerity, and Yankee attention to practical detail.[5] He was also deeply interested in the idea of survival in the face of hostile elements, historical change, and natural decay; at the same time he advocated abandoning waste and illusion in order to discover life's true essential needs.