The Transatlantic Slave Trade.

...Over the course of more than three and a half centuries, the forcible transportation in bondage of at least twelve million men, women, and children from their African homelands to the Americas changed forever the face and character of the modern world. The slave trade was brutal and horrific, and the enslavement of Africans was cruel, exploitative, and dehumanizing. Together, they represent one of the longest and most sustained assaults on the very life, integrity, and dignity of human beings in history.

 In the Americas, besides the considerable riches their free labor created for others, the importation and subsequent enslavement of the Africans would be the major factor in the resettlement of the continents following the disastrous decline in their indigenous population. Between 1492 and 1776, an estimated 6.5 million people migrated to and settled in the Western Hemisphere. More than five out of six were Africans. Although victimized and exploited, they created a new, largely African, Creole society and their forced migration resulted in the emergence of the so-called Black Atlantic.

The transatlantic slave trade laid the foundation for modern capitalism, generating immense wealth for business enterprises in America and Europe. The trade contributed to the industrialization of northwestern Europe and created a single Atlantic world that included western Europe, western Africa, the Caribbean islands, and the mainlands of North and South America.

Also see:

http://indiantribescouncil.blogspot.in/2012/11/battle-of-blacks-in-usa.html

http://indiantribescouncil.blogspot.in/2012/11/african-princess-in-topsfield.html

http://indiantribescouncil.blogspot.in/2012/11/american-holocaust.html 

http://indiantribescouncil.blogspot.in/2012/12/forgotten-slavery-of-america.html