In the 1830s and '40s, a movement advocating for reform gained momentum among anti-slavery abolitionists. They began creating networks and pathways to assist enslaved people in their escape from the South. By the 1850s, a well-structured system was established to facilitate migration from the South to the North, and eventually to Canada. Learn how abolitionists and the Underground Railroad became established in the North and its dramatic effects on the enslavement of African Americans.