Which west African state developed a trade relationship with Portugal during the mid-1400s bringing Europe in contact with their arts?

The West African state that developed a trade relationship with Portugal during the mid-1400s is the Kingdom of Benin. This engagement facilitated the exchange of goods, including ivory, pepper, and textiles, while also introducing European art styles to Benin. The relationship significantly influenced Benin's artistic traditions, leading to the creation of intricate bronze sculptures and other artistic works.