As differences increased between the regions, conflicts arose between people in the north and south. Over time, these conflicts, especially over slavery, got more and more intense. Evolutionists believed slavery should be ended, or abolished. The Abolitionist Movement gathered strength from the religious attitudes of the Second Great Awakening. They wrote letters to newspapers and made speeches, trying to outlaw slavery. Some abolitionists helped on the Underground Railroad.
One leading abolitionist, Harriet Tubman, let hundreds of enslaved African-Americans to freedom on secret route used to escape the south. These routes became known as the Underground Railroad.
The Underground Railroad was a network of people and safe houses who helped enslaved African-Americans escape to freedom.