Definition of trans-atlantic slave trade

The transatlantic slave trade was responsible for the forced migration of between 12 - 15 million people from Africa to the Western Hemisphere from the middle of the 15th century to the end of the 19th century. The trafficking of Africans by the major European countries during this period is sometimes referred to by African scholars as the Maafa ('great disaster' in Swahili). It's now considered a crime against humanity.