It was a movement spearheaded by the Quakers, and it only became popular when Harriet Beecher Stowe's novel "Uncle Tom's Cabin" became a bestseller.
Foi um movimento encabeçado pelos Quakers, e só se tornou popular quando o romance  de Harriet Beecher Stowe, "A Cabana do Pai Tomás",  se tornou num "best-seller".