West Africa from 1400-1800 saw the rise and fall of several major kingdoms and societies, including the Kingdom of Benin, the Songhai Empire, Hausaland, and the Kanem-Bornu Empire. These societies participated extensively in trans-Saharan trade but also engaged in slave trading, first within Africa and later in the transatlantic slave trade. The transatlantic slave trade had a devastating impact on African populations and societies, resulting in over 12 million Africans being taken abroad as slaves and millions more being forced to relocate within Africa. This massive loss of populations disrupted African cultures, development, and economies.