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“In opposition, others argued for “monogenesis,” claiming all races had a common origin and so all races shared a common humanity, despite physical differences. Just before the war, abolitionists like Henry David Thoreau turned to a new book, Charles Darwin’s On the Origin of Species, using it to oppose Agassiz and to argue for a common humanity.13”
― James P. Byrd, A Holy Baptism of Fire and Blood: The Bible and the American Civil War