The document summarizes the history of slavery in colonial America in three parts. It first discusses how the first Africans arrived in chains and over 10 million slaves were brought to the new world by Europeans. Second, it explains that slaves were needed to grow cash crops like tobacco in southern colonies to maximize profits. Third, it provides an overview of the triangular slave trade route between North America, Africa, and England that involved the transport of slaves, goods, and raw materials in each direction.