Why were africans called black gold?

Africans were referred to as "black gold" primarily due to their value in the transatlantic slave trade, where enslaved Africans were seen as a profitable commodity for labor in plantations and industries, particularly in the Americas. The term reflects the economic exploitation and dehumanization they faced, as their forced labor contributed significantly to the wealth of European nations. Additionally, "black gold" can also hint at the rich cultural heritage and resilience of African peoples, highlighting their enduring legacy despite the historical injustices they suffered.