George Morton sold his daughter Ellen 'a certain Mulatto girl a slave about fourteen years of age named Sally, being the child of a certain Negro woman named Ann'. One of the most well-known voices for freedom around the Revolutionary era was Phillis Wheatley of Massachusetts. Emancipation Proclamation Slavery was abolished in the United States in , with the ratification of the 13th Amendment. Early on, slaves in the South worked primarily in agriculture, on farms and plantations growing indigo, rice, and tobacco; cotton became a major crop after the s. African and African American female slaves occupied a broad range of positions. Ann Arnold was the wet nurse of a child whose parents were born in the English isle of Jersey. This also explains why female slaves were less likely to run away than men. Later on they were used in many factories, instrumental in the development of the United States, where they were kept at lower maintenance costs. It was also not uncommon for enslaved women to be raped and in some cases impregnated by their masters. Even after she had two children of her own, he threatened to sell them if she denied his sexual advances. Museum of Fine Arts, Boston. Many slaves sought their freedom through self-purchase, the legal system of freedom suits , and as runaways, sometimes resulting in the separation of children and parents. Over , of these slaves were in Virginia. They were expected to do field work as well as have children, and in this way increase the slave population. From to an estimated number of 43, slaves were imported into Virginia, and almost all but 4, were imported directly from Africa. Cotton was the leading cash crop during this time, but slaves also worked on rice, corn, sugarcane, and tobacco plantations, clearing new land, digging ditches, cutting and hauling wood, slaughtering livestock, and making repairs to buildings and tools.