2015 Nigerian general election north-eastern states. The government closed its land and sea borders from midnight on 25 March until the end of the polling date. The election was extended to 29 March due to delays and technical problems with the biometric card readers. It was the most expensive election ever to be held on the African continent. Nigeria is the continent's most populous country, has its largest economy and is its leading oil producer. Opposition candidate Muhammadu Buhari won the presidential election by more than 2.5 million votes. Incumbent President Goodluck Jonathan conceded defeat on 31 March, before the results from all 36
Goodluck Jonathan George Washington University, although she later denied it. None of the corruption allegations against Jonathan have been proven in any law court. Since May 2015, the Muhammadu Buhari administration reportedly has been fighting corruption that was perpetrated under Jonathan. Some of the former political office holders and appointees that served under Jonathan, as well as party members, have been arrested on various corruption charges. It is alleged that some, including former Finance Minister Nenadi Usman, have returned part of the money they stole. None of these politicians have however been convicted of the alleged crimes. It remains unclear whether or