...here is a link:

                                                          http://africanhistory.about.com/od/slavery/tp/TransAtlantic001.htm

The Trans-Atlantic Slave Trade

A review of the triangular trade with reference to maps and statistics.

By Alistair Boddy-Evans

"The Trans-Atlantic Slave Trade began around the mid-fifteenth century when Portuguese interests in Africa moved away from the fabled deposits of gold to a much more readily available commodity -- slaves. By the seventeenth century the trade was in full swing, reaching a peak towards the end of the eighteenth century. It was a trade which was especially fruitful, since every stage of the journey could be profitable for merchants -- the infamous triangular trade.

Why did the Trade Begin?

Expanding European empires in the New World lacked one major resource -- a work force. In most cases the indigenous peoples had proved unreliable (most of them were dying from diseases brought over from Europe), and Europeans were unsuited to the climate and suffered under tropical diseases. Africans, on the other hand, were excellent workers: they often had experience of agriculture and keeping cattle, they were used to a tropical climate, resistant to tropical diseases, and they could be "worked very hard" on plantations or in mines.

Was Slavery New to Africa?

Africans had been traded as slaves for centuries -- reaching Europe via the Islamic-run, trans-Saharan, trade routes. Slaves obtained from the Muslim dominated North African coast however proved to be too well educated to be trusted and had a tendency to rebellion.

Slavery was also a traditional part of African society -- various states and kingdoms in Africa operated one or more of the following: chattel slavery, debt bondage, forced labor, and serfdom. See Types of Slavery in Africa for more on this topic.

What was the Triangular Trade?

All three stages of the Triangular Trade (named for the rough shape it makes on a map) proved lucrative for merchants.

The first stage of the Triangular Trade involved taking manufactured goods from Europe to Africa: cloth, spirit, tobacco, beads, cowrie shells, metal goods, and guns. The guns were used to help expand empires and obtain more slaves (until they were finally used against European colonizers). These goods were exchanged for African slaves.

The second stage of the Triangular Trade (the middle passage) involved shipping the slaves to the Americas.

The third, and final, stage of the Triangular Trade involved the return to Europe with the produce from the slave-labor plantations: cotton, sugar, tobacco, molasses and rum."

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