 
 <prompt> "Where trade dey open up and expand? Based on di last question, write one context wey contain di answer. E fit be 1 - 20 sentences." <response>: For centuries, different people for modern-day Nigeria dey trade with traders from North Africa. Cities for the area come be regional centers for broad network of trade routes wey spread across western, central and northern Africa. For di 16th century, Spanish and Portuguese explorers na im be di first Europeans wey start significant, direct trade with people for modern-day Nigeria, for di port wey dem call Lagos and for Calabar. Europeans dey trade goods with people for di coast; coastal trade with Europeans also mark di beginning of di Atlantic slave trade. Di port of Calabar for di historical Bight of Biafra (wey dem dey call Bight of Bonny now) become one of di largest slave trading posts for West Africa for di era of di transatlantic slave trade. Other major slaving ports for Nigeria dey for Badagry, Lagos for di Bight of Benin and for Bonny Island for di Bight of Biafra. Majority of those wey dem enslave and carry go these ports na people wey dem capture for raids and wars. Usually, dem go carry di captives go back to di conquerors' territory as forced labor; after some time, dem fit acculturate and absorb dem into di conquerors' society. Some slave routes dey wey dem establish throughout Nigeria wey dey link di hinterland areas with di major coastal ports. Some of di more prolific slave traders dey linked with di Oyo Empire for southwest, di Aro Confederacy for southeast and di Sokoto Caliphate for north. 