The transatlantic slave trade began during the 15th century when Portugal, and subsequently other European kingdoms, were finally able to expand overseas and reach Africa. The Portuguese first began to kidnap people from the west coast of Africa and to take those they enslaved back to Europe. Slavery played a crucial role in the development of the modern world economy. Slaves provided the labor power necessary to settle and develop the New World. Slaves also produced the products for the first mass consumer markets: sugar, tobacco, coffee, cocoa, and later cotton.