From the International Slavery Museum’s website:
The history of the transatlantic slave trade
For more than 2,000 years people in many different parts of the world have forced their fellow humans into slavery. Between about 1500 and 1900, Europeans forcibly uprooted millions of people from throughout West Africa and West Central Africa and shipped them across the Atlantic in conditions of great cruelty. To refer to the Africans who were enslaved only as ‘slaves’ strips them of their identity. They were, for instance, farmers, merchants, priests, soldiers, goldsmiths and musicians. They were husbands and wives, fathers and mothers, sons and daughters. They could be Yoruba, Igbo, Akan or Kongolese.
European slavers dispersed them across the Americas to lead lives of degradation and brutality, without thought for their personal lives. Millions died in the process. As a result, people of African descent are spread throughout the Americas and Western Europe. This is called the African Diaspora.
For more information visit History of the Slave Trade.