I believe the answer you are looking for is the "Neolithic Period".
Answer:
The History of Nigeria can be traced to settlers trading across the middle East and Africa as early as 1100 BC. Numerous ancient African civilisations settled in the region that is known today as Nigeria, such as the Kingdom of Nri, the Benin Empire, and the Oyo Empire. ... Nigeria became a British protectorate in 1901.
Explanation: