Nigeria had an eventful history. More than 2,000 years ago, the Nok culture in the present plateau state worked iron and produced experienced terracotta sculpture. The history of the northern cities of Kano and Katsina dates back to approximately 1000 A.D. In the following centuries, Hausa Kingdoms and the Bornu Empire became important terminals of north-south trade between North African Berbers and the forest people, exchanging slaves, ivory, and other products. The Yoruba Kingdom of Oyo was founded in 1400s. It attained a high level of political organization. In the 17th through 19th centuries, European traders established coastal ports for slave traffic to the Americas. Commodity trade, especially in palm oil and timber, replaced slave trade in the 19th century. In the early 19th century, the Fulani leader Usman dan Fodio launched an Islamic crusade that brought most of the Hausa states under the loose control of an empire centered in Sokoto.On October 1, 1960, the Federation of Nigeria achieved independence, initially as a constitutional monarchy. In June 1961, the northern part of the United Nations Trust Territory of British Cameroons was incorporated into Nigeria's Northern Region as the province of Sardauna, and in August 1963 a fourth region, the Mid-Western Region, was created. From the outset, Nigeria's ethnic, regional, and religious tensions were magnified by the disparities in economic and educational development. The Constitution of the Federal Republic of Nigeria was adopted on October 1, 1963. At the same time, Nigeria became a member of the Commonwealth and Dr. Nnamdi Azikiwe of the NCNC took office as first Nigerian's first President. On January 15, 1966, a group of officers overthrew the government. In May 1967, Lt. Col. Emeka Ojukwu, the military governor, declared the independence of the Eastern Region as the "Republic of Biafra." After General Muhammed was assassinated on February 13, 1976, Lt. Gen. Olusegun Oba...
