section_path: History/Pre-colonial era
section_name: Pre-colonial era
paragraph_text: Pre-colonial era
  
  In the 16th century, Portuguese explorers were the first Europeans to begin important, direct trade with the peoples of southern Nigeria, at the port they named Lagos (formerly Eko) and in Calabar along the region Slave Coast. Europeans traded goods with peoples at the coast; coastal trade with Europeans also marked the beginnings of the Atlantic slave trade. The port of Calabar on the historical Bight of Biafra (now commonly referred to as the Bight of Bonny) became one of the largest slave-trading posts in West Africa in this era. Other major slaving ports were located in Badagry, Lagos on the Bight of Benin, and Bonny Island on the Bight of Biafra. The majority of those taken to these ports were captured in raids and wars. Usually, the captives were taken back to the conquerors' territory as forced labour; they were sometimes gradually acculturated and absorbed into the conquerors' society. Slave routes were established throughout Nigeria linking the hinterland areas with the major coastal ports. Some of the more prolific slave-trading kingdoms who participated in the Atlantic slave trade were linked with the Edo's Benin Empire in the south, Oyo Empire in the southwest, and the Aro Confederacy in the southeast. Benin's power lasted between the 15th and 19th centuries. Oyo, at its territorial zenith in the late 17th to early 18th centuries, extended its influence from western Nigeria to modern-day Togo.
  
  In the north, the incessant fighting amongst the Hausa city-states and the decline of the Bornu Empire allowed the Fulani people to gain headway into the region. Until this point, the Fulani, a nomadic ethnic group, primarily traversed the semi-desert Sahelian region north of Sudan with cattle and avoided trade and intermingling with the Sudanic peoples. At the beginning of the 19th century, Usman dan Fodio led a successful jihad against the Hausa Kingdoms, founding the centralised Sokoto Caliphate. This empire, with Arabic as its official language, grew rapidly under his rule and that of his descendants, who sent out invading armies in every direction. The vast landlocked empire connected the east with the western Sudan region and made inroads down south conquering parts of the Oyo Empire (modern-day Kwara), and advanced towards the Yoruba heartland of Ibadan, to reach the Atlantic Ocean. The territory controlled by the empire included much of modern-day northern and central Nigeria. The sultan sent out emirs to establish suzerainty over the conquered territories and promote Islamic civilization; the emirs in turn became increasingly rich and powerful through trade and slavery. By the 1890s, the largest slave population in the world, about two million, was concentrated in the territories of the Sokoto Caliphate. The use of slave labour was extensive, especially in agriculture. By the time of its break-up in 1903 into various European colonies, the Sokoto Caliphate was one of the largest pre-colonial African states.
  
  A changing legal imperative (the outlawing of the Atlantic slave trade in 1807) and economic imperative (a desire for political and social stability) led most European powers to support the widespread cultivation of agricultural products, such as the palm, for use in European industry. The slave trade continued after the ban, as illegal smugglers purchased slaves along the coast from native slavers. Britain's West Africa Squadron sought to intercept the smugglers at sea. The rescued slaves were taken to Freetown, a colony in West Africa originally established by Lieutenant John Clarkson for the resettlement of slaves freed by Britain in North America after the American Revolutionary War.