Contact with European powers significantly impacted West Africa. European colonization introduced Christianity and Islam to many regions and disrupted traditional African religions like animism. It also led to the slave trade, taking many Africans from coastal areas to the Americas. While some nations like Nigeria gained independence in the 1960s, civil wars and conflicts have torn several countries like Liberia and Sierra Leone apart since decolonization. West African nations vary significantly from their climates to economies, with Nigeria now a top oil producer, coastal nations focusing on agriculture, and the Sahel experiencing drought issues.