Natural resources of Africa. Africa has a large quantity of natural resources, including diamonds, salt, gold, iron, cobalt, uranium, copper, bauxite, silver, petroleum and cocoa beans, but also woods and tropical fruits. Much of its natural resources are undiscovered or barely harnessed.
The man who came to your island is Christopher Columbus. He is from Europe and the reason he came to visit wasn't actually to find you. He was out on a voyage to find a direct water route west from Europe and Asia and stumbled upon the Americas. He wants to trade goods with you. If you decide to trade with him there will be cotton and rubber in your favor. Although he may seem trustworthy, do not trust him. There will be slavery and rivalries in Europe if someone does something wrong.
I'm pretty sure it is idiom