On October 1, 1960, Nigeria gained its independence from the United Kingdom. The new republic incorporated a number of people with aspirations of their own sovereign nations. Newly independent Nigeria's government was a coalition of conservative parties: the Nigerian People's Congress (NPC), a party dominated by Northerners and those of the Islamic faith, and the Igbo and Christian dominated National Council of Nigeria and the Cameroons (NCNC) led by Nnamdi Azikiwe, who became Nigeria's maiden Governor-General in 1960. Forming the opposition was the comparatively liberal Action Group (AG), which was largely dominated by Yoruba people and led by Obafemi Awolowo.

An imbalance was created in the polity by the result of the 1961 plebiscite. Southern Cameroon opted to join the Republic of Cameroon while northern Cameroon chose to remain in Nigeria. The northern part of the country was now far larger than the southern part. The nation parted with its British legacy in 1963 by declaring itself a Federal Republic, with Azikiwe as the first president. When elections came about in 1965, the AG was outmanoeuvered for control of Nigeria's Western Region by the Nigerian National Democratic Party, an amalgamation of conservative Yoruba elements backed heavily by the Federal Government amid dubious electoral circumstances.

Nigerian-Biafran War

This coup was counter-acted by another successful plot, supported primarily by Northern military officers and Northerners who favoured the NPC, it was engineered by Northern officers, which allowed Lt Colonel Yakubu Gowon to become head of state. This sequence of events led to an increase in ethnic tension and violence. The Northern coup, which was mostly motivated by ethnic and religious reasons was a bloodbath of both military officers and civilians, especially those of Igbo extraction.

The violence against the Igbo increased their desire for autonomy and protection from the military's wrath. By May 1967, the Eastern Region had declared itself an independent state called the Republic of Biafra under the leadership of Lt Colonel Emeka Ojukwu in line with the wishes of the people. The Nigerian Civil War began as the Nigerian (Western and Northern) side attacked Biafra (South-eastern) on July 6, 1967 at Garkem signalling the beginning of the 30 month war that ended in January 1970.[18] More than one million people died in the three-year civil war.

Following the war, Nigeria became to an extent even more mired in ethnic strife, as the defeated southeast and indeed southern Nigeria was now conquered territory for the federal military regime, which changed heads of state twice as army officers staged a bloodless coup against Gowon and enthroned Murtala Mohammed; Olusegun Obansanjo succeeded the former after an assassination.

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