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Content: For centuries Africans had sold other Africans to the Arabs as slaves. However, the trans-Atlantic slave trade grew until it was huge. In the 18th-century ships from Britain took manufactured goods to Africa. They took slaves from there to the West Indies and took sugar back to Britain. This was called the Triangular Trade. ( Many other European countries were involved in the slave trade). Some Africans were sold into slavery because they had committed a crime. However many slaves were captured in raids by other Africans. Europeans were not allowed to travel inland to find slaves. Instead, Africans brought slaves to the coast.