The Slave Trade and Its Effects on Early America Slavery played an important role in the development of the American colonies. It was introduced to the colonies in 1619, and spanned until the Emancipation Proclamation in 1863. The trading of slaves in America in the seventeenth century was a large industry. Slaves were captured from their homes in Africa, shipped to America under extremely poor conditions, and then sold to the highest bidder, put to work, and forced to live with the new conditions of America. There was no mercy for the slaves and their families as they