In October 1960, Nigeria gained independence from Britain and became a federal republic with an elected prime minister and a ceremonial head of state
In July 1966, a military coup led by Yakubu Gowon overthrew the civilian government and sparked a civil war that lasted until 1970 and claimed over one million lives
In December 1983, another military coup led by Muhammadu Buhari toppled the civilian government of Shehu Shagari and ushered in a period of authoritarian rule
In June 1993, a presidential election widely regarded as free and fair was annulled by the military regime of Ibrahim Babangida, leading to widespread protests and violence
In November 1995, Ken Saro-Wiwa, a prominent environmental activist and leader of the Ogoni people, was executed by the military regime of Sani Abacha for alleged involvement in murder
In May 1999, Olusegun Obasanjo became the first elected civilian president after 16 years of military rule
In April 2014, Boko Haram, an Islamist militant group, kidnapped more than 200 schoolgirls from Chibok town in Borno State, sparking global outrage and a campaign to #BringBackOurGirls
In March 2015, Muhammadu Buhari defeated incumbent Goodluck Jonathan in a historic presidential election that marked the first peaceful transfer of power between rival parties
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